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At night, or during an eclipse of the Sun, or when it's cloudy.

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15y ago

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Continue Learning about Astronomy

Are all constellations visible all the time?

No. As we orbit the Sun different constellations become visible, but we can only see them when it is dark. Constellations are in the sky during daylight, but the Sun is so bright, we cannot see them. A few months after that, they start to be visible in the evenings and soon at night, by which time other constellations are in daylight and cannot be seen. You will see any constellation at the same time of year, every year. So the constellations you see in the night sky tonight are the same as the ones you will see on this date in any other year. The only thing that will differ is where the Moon and planets are.


Is the sun always there?

Yes, the Sun is always there even though we cannot see it at night. The Sun will continue to be there for another 13 or 14 billion years.


How does the moon become a new moon?

The new Moon "phase" is when the Moon is (more or less) in front of the Sun. We cannot normally see the Moon in this phase. If the Moon is exactly in front of the Sun, the Moon covers the Sun and we see a solar eclipse.


Why can you see the sun only in the day time?

You can see the sun only in the daytime because it is the time when the sun is above the horizon and its light reaches the Earth. At night, the sun is below the horizon, and the Earth blocks its light, making it invisible to us.


Why do we have the nighttime when its dark and we cannot see the sun?

Nighttime occurs because the Earth rotates on its axis, causing different parts of the planet to face away from the sun. When a location is turned away from the sun, it experiences darkness, while the side facing the sun is illuminated. This cycle of day and night is a natural result of Earth's rotation and its position relative to the sun. During nighttime, we cannot see the sun directly, but it is still providing light to the other side of the planet.