Earth and Sky Geometries of the Sky. Latitude and Longitude.

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Presentation transcript:

Earth and Sky Geometries of the Sky

Latitude and Longitude

Grid system to find things on Earth Grid system to find things on Earth Poles, Prime Meridian, Equator Poles, Prime Meridian, Equator

Celestial Sphere Like Lat and Long for space Like Lat and Long for space Extrude Poles and equator Extrude Poles and equator Ecliptic Ecliptic

Ecliptic Tilt of the Earth ~23.5 o Tilt of the Earth ~23.5 o Why the ecliptic isn’t the celestial equator Why the ecliptic isn’t the celestial equator

In the Sky… Where to look for planets Where to look for planets

Polaris, the North Star Always there Always there –Not exactly stationary Great for navigation Great for navigation

RA and Dec

Seasons Ecliptic determines when each season starts Ecliptic determines when each season starts

Why a Year Has days Sidereal-Solar Sidereal-Solar Extra 1 o to turn Extra 1 o to turn 361/360*24hrs= extra hours 361/360*24hrs= extra hours Or 4 min/day Or 4 min/day Held over for leap year Held over for leap year To keep Sun in the correct part of the sky To keep Sun in the correct part of the sky

Moon Phases Sunlight comes from this direction Depicts fraction of Moon visible

Lunar Eclipse Safe to view Safe to view Full Moon phase Full Moon phase Moon at perigee for the longest duration Moon at perigee for the longest duration Used by Aristarchus to get relative size of Earth and Moon Used by Aristarchus to get relative size of Earth and Moon

Solar Eclipse NOT SAFE to view directly NOT SAFE to view directly Aphelion, perigee, node Aphelion, perigee, node

Other Kinds of Eclipses Partial Partial Annular Annular

Annular Eclipse May 20, 2012

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