What is an eclipse?
user
There is a new moon, so the sun and the moon are aligned on the same plane. In that moment, the shadow of the earth on the moon is a perfect eclipse.
assistant
But there's a lunar eclipse and a solar eclipse. What's the difference?
user
The lunar eclipse happens when the moon blocks the sun during the night. The solar eclipse happens when the sun blocks the moon during the day.  In a lunar eclipse, the moon appears as an orange or brown disk. In a solar eclipse, the sun looks like a crescent.
assistant
How often do they happen?
user
About two solar eclipses a year.  About two lunar eclipses a year.
assistant
What is an eclipse?
user
There is a new moon, so the sun and the moon are aligned on the same plane. In that moment, the shadow of the earth on the moon is a perfect eclipse.
assistant
But there's a lunar eclipse and a solar eclipse. What's the difference?
user
The lunar eclipse happens when the moon blocks the sun during the night. The solar eclipse happens when the sun blocks the moon during the day.  In a lunar eclipse, the moon appears as an orange or brown disk. In a solar eclipse, the sun looks like a crescent.
assistant
How often do they happen?
user
A lunar eclipse can only happen when the moon is full and in the sky. It's a rare occurrence.  A solar eclipse can happen with any phase of the moon.  It is the most rare.
assistant
What is an eclipse?