Short-term

In astronomy, vibrational or other periodic phenomena are referred to as short- periodic phenomena that have a period that is far below the average value.

The value itself - depending on the observed phenomenon - can be very different:

• For the shortest effects of the pole movement, a few hours
• For the short-period variables, a light curve with a repetition period of typically a few days
• with the short-period nutation of the earth's axis, periods of 5 to 14 days. Half a month is in stark contrast to the long-period nutation of 18.6 years
• In contrast, the short-period comets orbit the sun with orbital times of around 3 to 200 years. The Comet Halley (76 years) was a few decades ago as a long-period referred to, but we know now many of these celestial bodies whose return is in the millennia.