Huestis: A Guide to the Total Solar Eclipse of August 21, 2017
Monday, August 21, 2017
Eclipse Primer and Local Partial Eclipse Circumstances
Unfortunately totality will not be visible from southern New England. Here in Rhode Island about 65% of the solar disk will be covered by the Moon. However, a 16-18 hour drive could deliver you to a site within totality’s path. The following guide will detail all you’ll need to know to experience the eclipse from wherever you decide to observe it.
Why Does a Solar Eclipse Occur?
I think most everyone knows that the Moon orbits the Earth. And during a lunar month (29.5 days), the lunar disk exhibits varying degrees of illumination as the Earth/Moon/Sun angle changes continuously. We say that the Moon is going through phases. The main phases are New, First Quarter, Full, and Last Quarter, each phase lasting 7.375 days. For a solar eclipse to occur the Moon must pass between the Earth and the Sun. This scenario happens once a month only at New Moon. But why doesn’t a solar eclipse occur each month? Other factors determine whether an eclipse happens or not.
The Moon’s orbit is tilted five degrees from the plane of the ecliptic, the Sun’s apparent path across the sky. For most months the New Moon passes above or below the solar disk as viewed from the Earth. However, when the Moon crosses the ecliptic (a position in space called a node) coincident with the Sun, a solar eclipse can occur.
But wait! There’s more. I’ve often compared the celestial mechanics of a solar eclipse to a celestial ballet. The Earth, Moon and Sun must be in perfect alignment where a straight line could be drawn through their centers.
In addition, one incredible coincidence accounts for this spectacular event to happen at all. The Sun and Moon appear to be the same size. They cover an area in our sky of ½ of a degree. How can that be? Well, the Moon is 400 times smaller than the Sun but 400 times nearer to the Earth.
Different Types of Solar Eclipses
There are four different types of eclipses. When the proper alignment occurs, the Moon’s shadows can be projected onto the Earth’s surface. Yes, I did say shadows, for the Moon has two shadow cones. One is the dark shadow called the umbra. The lighter shadow is called the penumbra. For August’s eclipse the Moon will completely cover the Sun, resulting in a total eclipse. The umbral shadow will sweep across about 8,000 miles of the Earth’s surface in a path not more than 71 miles wide. If one could observe the progress of this eclipse from a vantage point out beyond the Moon’s orbit, this animation shows what would be seen. Observers within the path will see totality, which will last a maximum of two minutes and 40.3 seconds in the vicinity of Carbondale, Illinois and Hopkinsville, Kentucky. Observers outside the path will see a partial eclipse as they will be within the penumbral shadow. How much of the solar disk is covered will depend upon how far away from the path of totality one is.
A second type of eclipse called an annular eclipse can occur. During an annular eclipse the Earth, Moon and Sun are in alignment, but the Moon’s elliptical orbit has caused it to be a little farther from the Earth so that it doesn’t completely obscure the Sun. We then see a ring (annulus) of sunlight surrounding the Moon. Annular eclipses have very narrow paths where the “ring of fire” (the Sun’s photosphere and chromosphere) can be seen surrounding the Moon. They are dangerous to observe for this very reason. As with a total eclipse, observers outside the path will only see a partial eclipse.
There is also a rare solar eclipse type called a hybrid. Along the eclipse path the type can transition from annular to total or total to annular. This scenario occurs because during the event the Moon has moved closer to the Earth (blocking the Sun completely) or moved farther from the
Earth (not blocking the solar disk).
And finally, there is a fourth type of solar eclipse. The Moon is close to a node, but it doesn’t quite line up with the Sun and Earth. Only a partial eclipse will be seen. No totality or annularity.
Where and When does the August 21 Solar Eclipse Occur?
There is a wealth of information available on the internet about the August 21, 2017 total solar eclipse. One extremely useful interactive eclipse map can help with planning your eclipse experience: https://eclipse2017.nasa.gov/sites/default/files/interactive_map/index.html?zoom=1.
Zooming in and clicking on any location on the map will display details about the eclipse at these locations, including start time, time of mid-eclipse, end time, and how much of the solar disk will be covered by the Moon. Clicking within totality’s path will also show the start and end time of totality, also noting the duration of totality. The times are provided in UT (Universal Time – a worldwide time standard.) Be sure to convert the provided times to the desired time zone.
How to Safely Observe this Eclipse
Whether you observe the eclipse locally or travel to position yourself within the path of totality, one common safety protocol must be observed. While totality can be viewed without any special protective filters, if even a small portion of the Sun’s bright photosphere is visible, that unfiltered portion of the Sun can cause irreparable damage to one’s eyes. When observing the Sun, observe caution as well. Please heed the following guidelines.
A rather archaic method involves using a telescope to project the solar image onto a white sheet/screen. The advantage of using this observing method is that it allows many people to observe the image simultaneously. However, extreme caution must be observed. Do not leave this set-up unattended. You don’t want anyone accidentally stepping up to an unguarded eyepiece to take a look. And regarding eyepieces—do not use cemented eyepieces. Use air-spaced ones. Eyepieces have been ruined when the cement has melted due to the heat produced by the concentrated sunlight collected by a telescope. And furthermore, remember to cap off your finder scope. I have seen solar observers singe their hair or clothes by failing to do so!!
Don’t risk your eyesight or anyone else’s due to an oversight or an outright mistake. And if you have one of those department store refractors that often come with small glass or plastic solar filters, throw them away. Do not be tempted to use them because they have been known to shatter when exposed to the Sun’s concentrated image.
Think about what a small magnifying glass can do, and then imagine the amount of energy even a small telescope lens or mirror can focus. It’s not worth damaging your eyesight. Many years ago, when I first started out in astronomy, I had one of those unreliable dark green plastic solar filters shatter during a partial solar eclipse. Luckily I wasn’t looking through the eyepiece at the time.
The only time in which the Sun can be directly looked at will be if you are fortunate to be within the path of totality. No filters will be required then. However, before and after totality you will need eye protection. And I’m not talking about sunglasses either! Sunglasses will not provide adequate protection. Number 14 welder’s glass is safe to use. DO NOT use exposed film (if you still have some around) of any kind. This method is not safe.
If you purchased some solar eclipse glasses for the transit of Venus back in 2012, here’s your opportunity to put them to good use (considering clouds prevented many of us from observing that event). These inexpensive and safe eclipse glasses are available from a variety of manufacturers, including Rainbow Symphony.
If you do not have access to any of the above safe solar observing techniques, you could engage your family in an interesting project by constructing a viewing device called the Shoebox Pinhole Projection System (SPPS). Use the following link to access directions on how to build and use this simple viewer.
Remember, severe eye damage or even blindness can result from looking directly at the partial phases of the eclipse. Don't lose your sight to an oversight.
Partial Eclipse Visible in Rhode Island
As I mentioned in the introduction, the Rhode Island area will experience a partial eclipse. The accompanying graphic shows the time schedule for this event.
As the graphic shows, the eclipse begins (called 1st contact) at 1:28pm EDT when the Moon begins to slide from right to left in front of the Sun. Without optical aid this beginning phase will not readily be visible to the naked-eye. However, any increased magnification will help to catch sight of the Moon’s disk sooner as it begins to “take a bite” out of the Sun. The Moon will continue to move across the face of the Sun, until it reaches its maximum obscuration of only 65% at 2:47pm. That would be a good time to look under nearby trees to see images of the partial phase. These images are created in much the same way the shoebox eclipse viewer works. Spaces between the leaves act as a pinhole camera, resulting in a myriad of eclipse images projected upon the ground or onto any surface.
After that point the Moon will continue to move to the left, and will move off the solar disk (4th contact) at 4:00pm. (Since totality is not experienced locally, there is no 2nd or 3rd contact.) Your 2 hour and 32 minute eclipse experience will then be complete, and the celestial ballet performed by the Earth, Moon and Sun will continue until the next great local partial eclipse performance on June 10, 2021.
Furthermore, if you have an opportunity to travel to observe totality, make every effort to do so. To prepare yourself for that incredible experience please go to this Skyscrapers link for Part II of this primer. There I have outlined all the phenomena an observer should look for.
I hope everybody will have a chance to observe some aspect of the Great American Total Solar Eclipse. This guide should provide enough information to allow you to safely observe this spectacular event. School will not be in session, so I encourage parents to properly warn their children on the dangers of solar observing. Please don’t make them stay indoors though. Observe caution and everyone should safely experience one of Mother Nature’s most beautiful phenomenon.
Related Slideshow: 20 Free (or Almost Free) Things to do in New England Before Summer Ends - 2018
The Cliff Walk is one of Newport’s most famous attractions is its gilded age mansions lining the coast. Entry to the mansions will cost a fee, but with the Cliff Walk, you can enjoy views of the mansions with amazing views of the water all for free.
The 3.5 mile long path runs behind the mansions on the eastern shore of Newport. It is a National Recreation Trail – the first in New England! The majority of the walk is easy, but be sure to wear good shoes; the sand can make the path slippery.
The Freedom Trail is a two and a half-mile walking tour that connects 16 significant Boston landmarks.
Interior access to the Freedom Trail's sites is also free, except for the Paul Revere House, the Old South Meeting House and the Old State House.
The Freedom Trail is a great way to get exercise, explore Boston and learn about history, all at the same time.
If you buy tickets online they are discounted at $12 for adults, $10 for students and $6.50 for kids ages 6-12.
Providence WaterFire has grown to be an iconic Rhode Island event. Starting out in 1994 to celebrate the 10th anniversary of First Night Providence, it has grown to run continuously, once a month, from May-November and boasts over 80 blazing fires in the middle of the Providence River.
WaterFire is a not-for-profit organization that aims to creatively transform Providence – and they do! Each event is accompanied with music by artists from around the world, varies food stands and art stands to browse as you stroll along the river.
People have been drawn to the rugged coast of Maine throughout history. Awed by its beauty and diversity, early 20th-century visionaries donated the land that became Acadia National Park.
The park is home to many plants and animals, and the tallest mountain on the U.S. Atlantic coast.
Visit Acadia and hike granite peaks, bike historic carriage roads, or relax and enjoy the scenery.
The park entrance fee is FREE from August 25th to the 28th.
Besides that, admission is $12 while those 15 and under are FREE of charge
Merrimack, New Hampshire
The Budweiser Clydesdales are the most recognizable mascots in the beverage industry and a visit to the Clydesdale Hamlet at the Anheuser-Bush Brewery will get you a free meeting with them.
For this 21 and over, you can take a tour of the brewery and see it result in free beer at the end.
If you have kids who are not 21, they can visit the horses who are there year round. They will get a huge kick out of it.
Old North Church, located on Salem Street, is Boston's oldest surviving church, and it's also the place where Paul Revere gave the signal that the "British were coming," on April 18, 1775.
Once he gave the signal, two lanterns were raised high, meaning that they were coming by sea to Lexington and Concord, not land.
This event began the American Revolution.
Take a hike at Purgatory Chasm and see the unique landmark that formed naturally approximately 14,000 years ago. Theory has it that the chasm was formed near the end of the last Ice Age with the sudden release of glacial meltwater that had been dammed up. Pretty neat! The chasm is ¼ mile long and runs between giant granite rock, sometimes standing at 70 feet high! You do have to pay to park ($5 MA residents, $6 for out-of-staters), but exploring the reservation is completely free.
Take a 30 minute tour of Ben & Jerry's Ice Cream factory in Vermont and see where your favorite flavors of ice cream are made. It is just about ice cream season after all.
The factory is open year round and admission is just $4 for adults, $3 for seniors and kids 12 and under are FREE.
See a replica of the world's first submarine and learn about it through films before heading about the USS Nautilus for a free audio tour.
Nautilus was the first nuclear-powered submarine and the first vessel to travel 20,000 leagues under the sea. The ship is now open to the public year-round and is free.
Since 1983, the Boston Fire Museum has operated in the old firehouse on Congress street showing off the history of the Boston Fire Department. The Museum shows off antique fire equipment, fire alarm displays, photo displays, and artifacts.
Admission to the Museum is FREE.
PHOTO: Boston Fire Museum
See how potato chips are made during a free tour of the Cape Cod Potato Chip Factory.
Upon conclusion of the tour, you will even get a free sample of Cape Cod Potato Chips.
Runs from Worcester to Providence
The idea behind the Blackstone River Bikeway was to create a bike path running 48 miles, from Worcester to Providence along the National Heritage Corridor. It links the Blackstone River and the Blackstone Canal and will eventually connect with the East Bay Bike Path in Rhode Island. The path isn’t completed yet, but riders can enjoy the segment that is, free of charge.
Chocolate lovers this is for you.
Take a free tour of Lake Champlain Chocolates and even get some free samples. What is better than that?
The tour takes approximately 30 minutes and is seated. There is no walking involved.
Tours run Monday to Friday from 10 a.m. to 2 p.m.but are limited to 35 people.
PHOTO: Lake Champlain Chocolates
Head to Concord, Massachusetts and then to the Sleepy Hollow Cemetery where you will find "Author's Ridge."
Author's Ridge marks the final resting place of legendary writers such as Ralph Waldo Emerson, Henry Thoreau, Nathaniel Hawthorne and Louisa May Alcott.
New Haven, Connecticut
Take a free tour of Yale University and while you are there be sure to walk through the Yale Art Gallery and the Yale Center for British Art.
If you time it correctly, you might even get to attend one of the Yale School of Music’s nearly 300 annual performances.
The Sprinkler Factory is not actually factory, but rather a gallery. Though, its namesake does come from the real-life sprinkler factory started by Howard Freeman in WWII. Why? Because he embodies “the spirit of innovation.”
With the aim of providing the public with a place to display and enjoy the visual arts, the Sprinkler Factory hosts exhibitions once a month, and they’re always free.
PHOTO: Sprinkler Factory
South Deerfield, Massachusetts
Yankee Candle Village headquarters are located in South Deerfield, Massachusetts, where they call themselves “Scenter of the Universe.”
Walk around the store for hours, exploring all the different showrooms with varying scents. The complex is something to see.
Be warned though, you may be tempted to buy a candle or two.
Runs from Providence RI to Bristol RI
If you’re looking for a dose of natural beauty and healthy activity, try going for a spin on the East Bay Bike Path. The first bike facility to be under the State, it is a 13.8 mile trail that connects 8 different parks from Providence to Bristol. Do the whole thing or just a stretch and cross over bridges and by coves on the Narragansett Bay shore. The bike path is open year round.
Photo: Michael St Jean/Flickr
Eartha at DeLorme Mapping Company
Eartha is the worlds largest rotating globe taking up three stories and is entirely computer controlled and rotates.
It is about as life-size a replica of the earth as you will find anywhere.
The DeLorme Mapping Company was bought by Garmin and is closed, however, the building is still open for those who wish to view the giant globe.
Tourists also have access to the second and third-floor balcony for a different view of the globe.
Admission is FREE.
PHOTO: DeLorme Map Company
If you want a little bit of an outdoor adventure, hike to Royalston Falls in Royalston, MA. The hike itself isn’t too long, but it can be challenging. It leads you to a remote gorge created by prehistoric glacial meltwater and 45 foot plunging waterfall within a half-hidden ravine. If you’re up for the adventure, the destination is far worth the trek.
- Huestis: Meteor Shower Prospects for 2016 & Other Astronomical Highlights
- Huestis: The Mystery of the Christmas Star
- Huestis: Prime Time for Observing Jupiter
- Huestis: A Few Astronomical Highlights for Stargazers
- Huestis: Transit of Mercury - An Infrequent Astronomical Event
- Huestis: A Gem of a Meteor Shower & Maybe a Naked-eye Comet
- Huestis: Astronomical Highlights for November
- Huestis: “Thunderstones” of August: the Perseid Meteor Shower
- Huestis: Moon to Cover Bright Star in Taurus
- Huestis: The Total Lunar Eclipse
- Huestis: October’s Morning Planetary Parade & 2 Meteor Showers
- Huestis: Fireball Over New England Tuesday Morning Was “Bright One”
- Huestis: Dual Planetary Close Encounters
- Huestis: Starry Nights of February
- Huestis: Astronomical Highlights of 2017
- Huestis: Observing the Last Quarter Moon
- Huestis: Astronomical Events Determine Easter Observance
- Huestis: Summer is for Saturn
- Huestis: Geminid Meteor Shower Mooned Out & Other Celestial Happenings
- Huestis: November Skies Have Something for Everyone
- Huestis: Astro Humor & Two Late-July Meteor Showers
- Huestis: A Shower of Comet Dust - Get Ready for the Perseids
- Huestis: Venus and Jupiter Appear to Merge
- Huestis: Meteors & Other Astronomical Treats
- Huestis: Astronomical Potpourri in July