When is the best time to obtain the amplitude?

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Asked on September 5, 2021
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The best time to take amplitude is when the body is theoretically rising or setting. This means when the sun's lower limb is half the Semi Diameter above the visible horizon. At this time, the centre of the body is at the rational horizon, but the body is seen above the visible horizon because of refraction.

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Posted by marinetales
Answered on September 6, 2021