What is Ex meridian method to get position line or ship position ?

It is sometimes not possible to obtain the altitude of the celestial body when it is on same observer’s meridian due to cloud, environmental factors, etc. If the altitude of the celestial body can be obtained a few minutes before or after meridian passage, the Ex-Meridian method can be used to reduce the observed altitude to meridian altitude.

The latitude of the observer can be determined. The position line runs nearly in an east-west direction.


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