Spix's view of the moon: moon phases, lunation and moon age

The moon accompanies us throughout the month. He changes his appearance every day. After the new moon it is visible shortly after sunset as a narrow sickle in the western sky, a few days later it appears in the evening as an increasing crescent and again a few days later it shines all night as a brightly lit full moon. Then the moon takes off again until it is no longer visible at new moon. This weekend begins shortly after the new moon a new cycle with a narrow crescent moon at dusk.

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One month moon

Moon phases are the constant change of appearance, the increase and decrease of the moon during an orbit. The movement of the moon around the earth can be recognized within a few hours relative to the stars. Already the next day our Trabant is at the same time about 12 ° further east in the sky. The complete sequence of all moon phases from one new moon to the next is called lunation or lunar month. For this cycle, the moon needs 29.53 days.

The moon age

The progression of the moon phases during a lunation is counted in days that have passed since the last new moon. This so-called Moon Age begins at 1d (from Latin this), the 1st day after new moon and is consecutively numbered until 29d, the 29th day after the new moon. The count then starts from the beginning after the next new moon. In the first 24 hours after the new moon, the age of the moon is also given in hours.

The direction is important

Like the planets, the moon does not emit its own light but is illuminated by the sun. Thus, depending on the position of the moon, during a circumnavigation of the earth, only a certain part of the surface is seen.

At the new moon, the moon stands between the sun and the earth, so that one looks at his side, which is not illuminated by the sun, and he remains invisible. At full moon, however, the moon is opposite the sun and appears as a fully illuminated disc. The other phase shapes arise from the corresponding angular positions of the moon and the sun to each other. Lambert Spix

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