1. what astronomical unit of length do these numbers represent? a.1*10^13 km b.

Question

1. what astronomical unit of length do these numbers represent?

a.1*10^13 km

b. 1.5*10^8 km

c. 3.26 ly

2. what is the distance from earth to the Sun in kilometers?

3. If an object is halfway up in the sky(between the horizon & zenith) and it is due west, what is its Altitude and Azimuth?

4. If a celestial object is 39AU away, how many kilometers is that( in scientific notation)?

5.Looking from outer space, down on the North Pole, which way does the Moon revolve around the Earth?

6. From the same point of view, which way is the Earth revolving around the sun?

7. What is the declination and right ascension of the sun on September 21st?

Explanation / Answer

1)

a.1*10^13 km = 1 light year (It is the distance that light travels in 1 year. )

b. 1.5*10^8 km =1 AU ( Distance between the Sun and the Earth)

c. 3.26 ly =1 pc ( Parsec, distance unit in astronomy)

2) The distance from earth to the Sun is defined as 1 AU (Astronomical Unit) which is 1.5 x 108 km

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