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The compass and the sundial are two completely different instruments which were built for entirely different uses.
The compass is an instrument that is used for navigation and includes a free-floating magnetized needle which, when held level and still, aligns itself with the earth’s magnetic field and in doing so, points approximately north.
The sundial is an instrument that is designed for a specific location on the earth and permanently installed there so that the shadow of one of its parts indicates the hour of the day. Of course, this only works during daylight hours and when the sun is making shadows.