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This introduction to coordinates on a sphere explains how latitude and longitude define locations on Earth, and similarly, how declination and right ascension define locations on the celestial sphere. The lesson also introduces systems of time-keeping, e.g. local solar time, time zones, universal time and the International Date Line. The objectives are for the student to know how any location on Earth can be defined by its latitude and longitude. The student will also learn the difference between local time and universal time, and the various adjustments made to clock time, e.g. time zones, daylight saving time and the use of the International Date Line. Finally, the student should learn that any position on the celestial sphere can be defined by declination and right ascension, which are similar to latitude and longitude except that declination is measured from the north pole, not from the equator and right ascension is traditionally given not in degrees but in time units - hours, minutes and seconds.
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