before_revision: Ex- Meridian is an astronomical navigation method of calculating an observer’s position on earth . The method gives the observer a position line on which the observer is situated. It is usually used when the sun is obscured at noon  and as a result  a meridian altitude is not possible. The navigator measures the altitude of the sun as close to noon as possible and then calculates where the position line lies.
after_revision: Ex-meridian is a celestial navigation method of calculating an observer’s position on Earth . The method gives the observer a position line on which the observer is situated. It is usually used when the Sun is obscured at noon , and as a result , a meridian altitude is not possible. The navigator measures the altitude of the Sun as close to noon as possible and then calculates where the position line lies.
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