Question about planet venus?

Question

What is the difference between the evening star and the morning star? Are they different in size? ( just like the phasing of the moon. it could be a half moon, a full moon, a quarter moon etc.)

Answer 1

The difference is which side of the sun it is from our point of view. If it is trailing the sun, then it is the evening star. If it is leading it, then it is the morning star.

Venus would have phases, but given the distance, a telescope is needed to notice them, and a "new Venus" means that it would be lost in broad daylight anyway, unless there is a transit of Venus.
And a "full Venus" would be rather close to the sun as well, from our perspective, thus hard to see (and it would have to be far, on the other side of the sun)

Answer 2

The name is applied to Venus and comes from a time when nobody knew the difference between a star and a planet.

It is merely the case that Venus orbit is inside the Earth’s orbit, and if you think about that, it becomes obvious that Venus only appears in the quarter of the sky that the sun is in. That means you see Venus just after sunset or just before sunrise.

The ancients also did not realise the Earth rotates on its axis, so they thought the morning Venus was different to the one they had seen previously in the evenings.

That is the origin of the morning and evening star.

Answer 3

"Morning star" and "evening star" are both terms for Venus, as I guess you knew.

It's the Morning Star when you can see it in the morning (before sunrise), and the Evening Star when you can see it in the evening (after sunset).

It orbits the Sun faster than us, so it changes position in our sky throughout the year. Because it's closer to the Sun than us, it's always close to the Sun from our vantage point, so it sets and rises within an hour or two of the Sun doing the same. Venus (and Mercury) isn't an object that you're going to see in sky at midnight, only morning and evening (hence the name).

Answer 4

Since Venus is closer to the Sun than Earth, it is always seen fairly near the Sun. It seems to move west of the Sun for a while, then turn around and move back past the Sen to end up east of the Sun and than back again. When it is East of the Sun it can only be seen for a few hours after sunset, and when it is west of the Sun it can only be seen for a few hours before sunrise. So it can be seen in evening or morning, but never at midnight.