In any particular place on Earth, certain constellations are visible in the evening only at certain times of the year because __
_______. A) during some times of year, some constellations drop below the southern horizon
B) some constellations are circumpolar
C) on any particular night, we can only see stars that are directly opposite (180 degrees away from) the Sun in the sky
D) our evening view of space depends on where Earth is located in its orbit around the Sun
Constellation usually refers to the group of stars that forms a particular feature in the sky and which is visible at night. This is visible when the earth is located at the exact position from which it can be viewed. It often helps in the identification and location of the stars in space.
These constellations are visible from the earth when viewed in the evening, but only at particular times in a year. It is because the earth keeps on changing its position with respect to the sun. The earth goes around the sun in an elliptical orbit, and only at a few positions, with favorable conditions such as clear sky, these constellations are visible.
