Modern people's name for the moon phase.

New moon (the first day of the lunar calendar, the new moon): 0 degrees; crescent

In the new moon, when the weather is clear, there can be a scene where the new moon embraces the old moon, that is, the jing xing appears. Emei month (usually around the second day of February-around the seventh day of July): 0-90 degrees; First quarter moon (around the eighth day of the lunar calendar): 90 degrees; Full moon (the ninth day of the ninth lunar month-around the fourteenth lunar month): 90 degrees-180 degrees;

Full moon; The baby is one month old.

Full moon (full moon)

Day, around the 15th or 16th lunar month): 180 degrees;

After the full moon

The loss of the full moon (about 16 to 23 in the lunar calendar): 180-270 degrees; First quarter moon (around the 23rd lunar month): 270 degrees; The waning moon (around the 24th lunar month-the end of the month): 270 -360 degrees; The last day of the lunar calendar is called dark day, that is, the moon is not seen; There are mainly four kinds of moon phases: new moon (the first day of the lunar calendar), first quarter moon (around the eighth day of the lunar calendar), full moon (around the fifteenth day of the lunar calendar) and last quarter moon (around the 23rd day of the lunar calendar), all of which have definite occurrence times and are calculated by precise orbit calculation.

Edit this phase recognition.

Moon phase recognition

Assuming that the full moon is a circle, no matter how the phase of the moon changes, the connecting line between its upper and lower vertices must be the diameter of the circle (the phase of the moon is irregular during an eclipse). When the outer edge of the moon phase we see is close to the inverted C letter shape, then the moon phase at this time is before the fifteenth day of the lunar calendar. On the contrary, when the outer edge of the moon phase we see is close to the C letter shape, then the moon phase at this time is after the fifteenth day of the lunar calendar.

Moon phase change song

The new moon on the first day is invisible only because it is trapped in the sun and the earth.

On the eighth day of the seventh lunar month, the half moon faces west. 15, 16 The full moon rises, and the earth shoulders the sun and the moon. In the last quarter, the moon faces east until midnight. A formula (easy to remember): up to the west and down to the east-meaning: the first quarter moon appears in the first half of the lunar calendar, and the moon faces west and is located in the western half of the sky; The last quarter moon appears in the second half of the lunar calendar. The moon faces east and is located in the eastern half of the sky. Attachment: Moon Phase Change Diagram (Note: The directions on the starry sky map are upper north, lower south and due west of Zuo Dong. )