Dicks, D. R._solstices, Equinoxes, & the Presocratics_JHS, 86_1966!26!40
The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts –...
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Transcript of The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts –...
![Page 1: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/1.jpg)
The Celestial Sphere
Celestial Equator
Ecliptic
Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices
![Page 2: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/2.jpg)
The sky from 3 different position on Earth
![Page 3: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/3.jpg)
Origin of the seasons -- tilt of the Earth’s axis
![Page 4: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/4.jpg)
Precession
![Page 5: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/5.jpg)
Phases of the Moon
![Page 6: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/6.jpg)
Eclipses of the Sun and Moon
Solar – new moon
Lunar – full moon
Moon must be at one of the nodes of its orbit and the line nodes points to the Sun
![Page 7: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/7.jpg)
An Eclipse of the Sun
3 types – total, partial, annular
![Page 8: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/8.jpg)
Eclipse of the Moon
![Page 9: The Celestial Sphere Celestial Equator Ecliptic Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bfc01a28abf838ca3c4e/html5/thumbnails/9.jpg)
Next eclipses
Solar -- total July 22, 2009 -- India, China, Pacific
annular Jan 15, 2010 -- Africa, Indian Ocean, China
total July 11, 2011 – S. Pacific (Cook Islands, Easter Is.
Aug 21, 2017
April 8, 2024 *
Aug 23, 2044
Aug 12, 2045
Lunar -- Penumbral Feb 9, W. US
-- Partial Dec 31, E. Hemisphere