1. The Great American Solar Eclipse 8/21/2017
Augusta Rotary Club
July 24, 2017 Meeting
Gary J. Senn, PhD -

2. Are you excited about the event?
Eclipse PSA

3. 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

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

5. Types of eclipses
Partial
Total
Annular
Hybrid

6. Lunar eclipse from space
Image Credit:

7. Solar eclipse from space
Image Credit: Wikimedia Commons

8. How often do eclipses occur?
Why not every month?
Image Credit: AstronomyOnline.org

9. 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 = days = 6585d 07h 43m
239 Anomalistic Months = days = 6585d 12h 54m
242 Draconic Months = days = 6585d 08h 35m
Sidereal month 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

10. Solar Eclipses

11. 21st Century Solar Eclipses

12. 21st Century Solar Eclipses

13. 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.

14. Eclipse Resources
Credit: Rick Fienberg / TravelQuest Int'l. / Wilderness Travel.