What is the lunar cycle

The lunar phase or Moon phase is the shape of the Moon's directly sunlit portion as viewed from Earth. The lunar phases gradually change over a synodic month as the Moon's orbital positions around Earth and Earth around the Sun shift.

Explanation:

The lunar cycle is the representation of the moon's journey around the Earth. The movement around the Earth, moving between the earth and the sun, creates a shadow on the far side of the moon limiting the light that's reflected back to Earth.

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.