The Great American Solar Eclipse 8/21/2017

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Presentation transcript:

The Great American Solar Eclipse 8/21/2017 Augusta Rotary Club July 24, 2017 Meeting http://rpsec.usca.edu/eclipse/ Gary J. Senn, PhD - SennG@usca.edu

Are you excited about the event? Eclipse PSA

What is an eclipse? Eclipse: Obscuring of one solar body. It is all in the name. Solar Eclipse: Sol or the Sun Lunar Eclipse: Luna or the Moon - SME - SEM

How do eclipses occur? Lunar eclipse Solar eclipse Moon phase? Order? Full moon Order? SEM Solar eclipse New moon SME

Types of eclipses Partial Total Annular Hybrid

Lunar eclipse from space Image Credit: http://www.eclipsegeeks.com/

Solar eclipse from space Image Credit: Wikimedia Commons https://commons.wikimedia.org/wiki/File:Solar_eclipse_types.svg

How often do eclipses occur? Why not every month? Image Credit: AstronomyOnline.org http://astronomyonline.org/SolarSystem/LunarEclipse.asp

Saros series Chaldeans 300-100 BC One cycle in series repeats every: 6,585.3 days (18 years 11 days 8 hours) 223 Synodic Months = 6585.3223 days = 6585d 07h 43m 239 Anomalistic Months = 6585.5375 days = 6585d 12h 54m 242 Draconic Months = 6585.3575 days = 6585d 08h 35m Sidereal month - 27.321661 days (27 d 7 h 43 min 11.5 s). Time to get back to the same spot in the sky Latin = Sidera. English = Stars Synodic month – Latin = Synod. English = Meeting Anomalistic month Anomoly – something different or abnormal – going from perigee to perigee is abnormal from the observer’s perspective Draconic month – or Nodical month. Named for the dragons that live in the nodes and eat the sun or moon during eclipses

Solar Eclipses 1951-2000

21st Century Solar Eclipses

21st Century Solar Eclipses

Close is not close enough 99% is good if you are taking a test. Baked bread National championship football game Swimming pool Smelling freshly baked bread out of the oven is wonderful. It is close, but not close enough to tasting that bread. Tailgating at the national championship football game is amazing. It is close but not close enough to being on the sidelines in the stadium. Putting the tip of your finger in a swimming pool on a hot summer day is very nice. It is close but not close enough to getting into the pool.

Eclipse Resources http://rpsec.usca.edu/Events/Eclipse/SolarEclipse2017.html Credit: Rick Fienberg / TravelQuest Int'l. / Wilderness Travel.