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right ascension and declination of the point in the sky

Question 1

What are the right ascension and declination of the point in the sky where the ecliptic and the celestial equator intersect in March each year? The Sun crosses this point from the Southern Hemisphere to Northern Hemisphere in the sky.

R.A. = _____ H _____ M

Declination = __________ degrees __________ minutes (+,N; -, S)

Question 2

What is the name given to this point in space?

Question 3

Against what constellation does the Sun appear to be projected in the sky when it is located at this point?

Question 4

Now change the view from Earth looking toward the Sun, to that of the Sun looking toward the Earth. Use the blue direction buttons (Hint: Look 180 degrees from Sun. Turn on the equatorial grid, if necessary, and move 12 H in right ascension eastward). Against what constellation would the Earth appear to be projected when viewed from the Sun on the date in Question 1?

Question 5

What time of day would the constellation in Question 4 appear to be on your local celestial meridian?

Question 6

On what date does the Sun appear to be 23.5 degrees North of the celestial equator?

Question 7

What are the right ascension and declination of the point in Question 6?

R.A. = _____ H _____ M

Declination = __________ degrees __________ minutes (+,N; -, S)

Question 8

What is the name of this point in space?

Question 9

Against what constellation does the Sun appear to be projected on the date in Question 6?

Question 10

Now change the view from Earth looking toward the Sun, to that of the Sun looking toward the Earth. Use the blue direction buttons again (Hint: Look 12 H in right ascension eastward). Against what constellation would the Earth appear to be projected when viewed from the Sun on the date in Question 6?

Question 11

What time of day would the constellation in Question 10 appear to be on your local celestial meridian?

Question 12

What are the right ascension and declination of the point in the sky where the ecliptic and the celestial equator intersect in September each year? The Sun crosses this point from the Northern Hemisphere to Southern Hemisphere in the sky.

R.A. = _____ H _____ M

Declination = __________ degrees __________ minutes (+,N; -, S)

Question 13

What is the name given to this point in space?

Question 14

Against what constellation does the Sun appear to be projected when it is located at this point in the sky?

Question 15

Now change the view from Earth looking toward the Sun, to that of the Sun looking toward the Earth (use the blue directional buttons again). Against what constellation would the Earth appear to be projected when viewed from the Sun on the date in Question 12?

Question 16

What time of day would the constellation in Question 15 appear to be on your local celestial meridian?

Question 17

On what date does the Sun appear to be 23.5 degrees south of the celestial equator?

Question 18

What are the right ascension and declination of the point in Question 17?

R.A. = _____ H _____ M

Declination = __________ degrees __________ minutes (+,N; -, S)

Question 19

What is the name of this point in space?

Question 20

Against what constellation does the Sun appear to be projected on the date in Question 17?

Question 21

Now change the view from Earth looking toward the Sun, to that of the Sun looking toward the Earth (use the blue directional buttons again). Against what constellation would the Earth appear to be projected when viewed from the Sun on the date in Question 17?

Question 22

What time of day would the constellation in Question 21 appear to be on the local celestial meridian?

Solution Preview

Question 1

What are the right ascension and declination of the point in the sky where the ecliptic and the celestial equator intersect in March each year? The Sun crosses this point from the Southern Hemisphere to Northern Hemisphere in the sky.

R.A. = __0___ H ___0__ M

Declination = ____0______ degrees ____0______ minutes (+,N; -, S)

Question 2

What is the name given to this point in space?
Vernal Equinox

Question 3

Against what constellation does the Sun appear to be projected in the sky when it is located at this point? Pisces

Question 4

Now change the view from Earth looking toward the Sun, to that of the Sun looking toward the Earth. Use the blue direction buttons (Hint: Look 180 degrees from Sun. Turn on the equatorial grid, if necessary, and move 12 H in right ascension eastward). Against what constellation would the Earth appear to be projected when viewed from the Sun on the date in Question 1?
Virgo (basically the opposite solstice or equinox)

Question 5

What ...

Solution Summary

The solution explains right ascension and declination of the point in the sky. Celestial meridians are discussed.

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