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cos (tan i tan 0) The formula D = 24 1 - can be used to approximate the number of hours of daylight when the declination of the Sun is i" at a location 0 north latitude. To use the formula, cos (tan i tan 0) must be expressed in radians. Approximate the number of hours of daylight in a city at 28 3' north latitude on (a) the summer solstice (i= 23.5 ), (b) the vernal equinox (i = 0 ), and (c) July 4 (1 = 22 48'). (a) The number of hours of daylight on the summer solstice is hours. (Do not round until the final answer. Then round to the nearest hundredth as needed.) K