1 In the northern hemisphere, the first quarter moon faces west, appearing in the middle of the night, and the moon faces east. The last quarter of the moon appears at midnight, and the moon faces west. The southern hemisphere is just the opposite of the northern hemisphere.

2. The moon before the lunar calendar 15 of each month is the first quarter moon, with the crescent moon facing up, and the second half month is the second quarter moon, with the crescent moon facing down.

3. Add: The sun, the earth and the moon are in a certain position. You just need to remember: "Go up to the west and down to the east".

4. First quarter moon: The first quarter moon comes out in the middle of the night, comes out in the west, and the moon faces west.

5. Last quarter moon: opposite to the first quarter moon.