Astronomy Chapter 2

Front 1

(a) What is the Celestial Equator

Back 1

(a) The CE is the pro jection of the Earth’s equator into space.

Front 2

(b) How are the North and South Celestial
Poles (NCP and SCP) related to the Earth’s equator and its axis of rotation?

Back 2

b) This projection defines a circle on, and a plane through, the celestial sphere (i.e., on the sky). The NCP and SCP are the pro jections
of the Earth’s poles onto the CE (refer to Figure 2-9).

Front 3

(c) Where
on Earth would you have to be for the CE to pass through your zenith?

Back 3

(c) If you want to see the CE overhead (at your
zenith) then you must be located somewhere along the Earth’s equator (0 degrees latitude).

Front 4

How many degrees is the angle from the horizon to the zenith?

Back 4

he angle between the zenith point and the plane of your horizon is 90◦ .

Front 5

Celestial Sphere

Back 5

An Imaginary sphere of very large radius centered on an observer

Front 6

celestial equator

Back 6

the earths equator projected in space. presumably the equator of the celestial sphere.

Front 7

celestial poles

Back 7

north and south pole projected into the celestial sphere

Front 8

zenith

Back 8

point in the sky directly above the observer's head