Abstract
By studying the parameters of the empirical equation for instantaneous clear weather insolation at Nsukka [1] (6.8°N, 7.35°E), a theoretical equation for instantaneous clear weather insolation was derived for locations on latitude 6.8°N. The theoretical equation is based on the assumptions that 1. (1) the solar constant is 1370 W m −2 [2], 2. (2) the Earth is a true sphere, 3. (3) the speed of rotation of the Earth is constant all through the day, 4. (4) the insolation received at sea level is 78% of the insolation received at the top of the terrestrial atmosphere under clear weather conditions [3]. The parameters of the empirical equation were compared with the parameters of the theoretical equation. The two equations agree within 2.6%.
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