When the moon revolves around the earth and the earth revolves around the sun with the moon, the positions of the moon and the sun change constantly. If the moon and the sun are neither too far nor too close, that is, in the days before and after the first chord or the second chord, the moon will appear in the sky with the sun in broad daylight, sometimes in the east of the sun and sometimes in the west of the sun.
Before and after the first chord (the seventh and eighth day of the lunar calendar, the semicircle in the west of the moon can be seen on the earth, which is named because the moon looks like a bow), the moon is in the east of the sun. The moon appeared a few hours after the sun rose these days. When the sun was west after noon, the moon rose very high and was clearly visible. At this time, the moon is in the East and the sun is in the west, hanging in the sky at the same time. Therefore, between the fourth five day and the eleventh two day of the lunar calendar, from morning to afternoon, as long as the weather is fine, we can see a hazy moon in the east of the sun.
The moon lies to the west of the sun before and after the lower chord (the moon's eastern semicircle can be seen on the earth, which is named because the moon looks like a bow). The moon rises a few hours earlier than the sun. At dawn, the sun hasn't come out. The moon is already hanging in the slightly bright sky. When the sun rose at dawn, the moon had climbed high. Since then, until the moon sets from the west, the moon and the sun have been "companion" in the sky, the shining sun in the East and the eclipsed moon in the West.