Evening Sky Map
Before using even the most basic of sky maps it’s important to
understand how we pinpoint the positions of stars in the sky. As the
Earth spins on it’s axis, all stars appear fixed in place in relation to
each other and move together across the night sky from east to west.
Picture the Earth at the center of a huge imaginary celestial sphere.
With all the stars visible on its inside surface, this sphere’s
Celestial North is marked by the North Star, Polaris. Therefore, when
reading star charts always remember that Celestial North is not up but
towards Polaris. we then transfer the familiar coordinate system of latitude and
longitude used on the Earth’s surface onto this star globe, we have a
celestial grid system that mimics its terrestrial counterpart. In the
sky, “latitude” is called <em>declination</em> while the
“longitude”
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