Which coordinate system would be most useful for two observers (one in michigan and one in florida) who wants to observe the same astronomical object and discuss their observations over the phone as they’re making them? a. celestial or azimuth-altitude b. celestial c. horizontal d. azimuth-altitude

Answer : Celestial or azimuth - altitude

Explanation :  

Celestial : The celestial coordinates that are analogous to longitude and latitude are called RA and Dec.

RA = Right Ascension

Dec = Declination

RA is the measured in unit of time and Dec is measured in degree.

The equatorial coordinate system is the projection of the latitude and longitude coordinate system on the celestial sphere.

Azimuth - altitude :  Azimuth - altitude define the location of an object in the sky.

The altitude is the distance of an object appears to be above the horizon.

The Azimuth of the object is the angular distance  along the horizon to the location of the object.

The answer is actually A: celestial

Explanation:

The answer is not azimuth-altitude because using that system means that the coordinates change with your geographic location. With celestial, you can coordinate the object's location using right ascension and declination no matter what latitude you are standing at.

temp rises, and expansion

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2