rising and setting of stars

Certain types of rising and settings must be inferred instead of observed, because the star is obscured by sunlight. These are used only by astronomers.

Perceptible risings and settings

These risings and settings can be observed directly, and it is these which have played a part in calendars.

The actual times of these events, for 7 selected stars, can be calculated from volume 1 of Sight Reduction Tables for Air Navigation.

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