(a) Highlight four effects of the revolution of the earth. (b) A boxing tournament is scheduled to start at 8.00 p.m. local time in Los Angeles, 75°W. At what time should boxing fans in Nigeria, 15°E, switch on their televisions to watch the commencement of the match?
Explanation
(A) EFFECTS OF REVOLUTION OF THE EARTH (i) It fixes year. (ii) Causes changes in the sun's altitude at different times of the year. (iii) Brings about four seasons in the temperate regions and two seasons in the tropics. (iv) Causes variation in seasonal temperature. (v) It brings about varying lengths of day and night at different times of the year. (B) Difference in longitude 75° + 15° = 90° If 1° is equivalent to 4 minutes or 15° is equivalent to 1 hour Therefore 90° = 90 x 1 hr. 15 = 6 hours Since Nigeria is ahead of Los Angeles we add. i.e. initial time + calculated hour. 8.00 p.m. + 6 hours. = 2 a.m, the following day.
