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Calculate the duration of evening astronomical twilight for a place in latitude 50 N when the Sun’s.

Calculate the duration of evening
astronomical twilight for a place in latitude 50 N when the Sun’s
declination is 5 20’
N.

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At mean noon on a certain date, the
sidereal time was 14 hours. What will the sidereal time be at mean noon 50 days
after, in the same place? Take the length of a tropical year to be 365  days.

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