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Show that at the spring equinox, for a place in latitude f, the Sun will become visible at the top..

Show that at the spring equinox, for a
place in latitude φ, the Sun will become visible at the top of the tower
of height h feet about 13·94 sec φ seconds
earlier than it will at the foot of the tower. (Neglect refraction.)

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The Moon’s apparent zenith distance was
measured to be 43 28’.
Calculate its true zenith distance if the value of the Moon’s horizontal
parallax was 60’. (Neglect refraction.)

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