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The complement of the latitude; the difference between latitude and 90°.
‘Here is a table of the number of daylight hours as a function of the time of year for the first 26 weeks of the solar year, for several co-latitudes in the Northern Hemisphere.’
‘If your co-latitude plus the declination of the star is greater than zero, then it will rise above your horizon at least sometime during the year.’
‘The greatest departures are for beams lying near the limit of our co-latitude range.’
‘Here that would be the angle between OP and the Earth's axis, known as the co-latitude of P.]’
‘Thus the co-latitude of 52 is 90-52 = 38 degrees.’