Monthly Archives: July 2016

Understanding Meridian Passage (Mer Pas)

Meridian Passage occurs when a celestial body crosses the observer’s meridian of longitude and at that instant, it will reach its greatest altitude above the observer’s horizon. The following diagrams will help to explain how the latitude can be calculated from the … Continue reading

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Altitude Corrections For The Moon

Continuing the series on the Moon. When a navigator measures the altitude of the Moon, there are several corrections that he has to make to the readings. Corrections For The Moon’s Semi-Diameter.  The point on the Moon’s circumference nearest to … Continue reading

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