(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 wh...
Question 1 Report
(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?
Answer Details
(a) Four effects of the revolution of the earth
- The four seasons: as the earth revolves round the sun with its axis tilted, the overhead sun shifts between the tropics, giving spring, summer, autumn and winter in temperate lands.
- Varying length of day and night: at different times of the year, days and nights become unequal in length (long days/short nights in summer and the reverse in winter), except at the equator.
- Changing altitude (apparent movement) of the midday sun: the noon sun is high overhead at some seasons and low at others.
- Occurrence of equinoxes and solstices, and the basis of the calendar year (365.25 days), leading to a leap year every fourth year.
(b) Time calculation
Match starts at 8:00 p.m. local time in Los Angeles (75°W). Find the time in Nigeria (15°E).
Difference in longitude \( = 75^\circ + 15^\circ = 90^\circ \).
\[ \text{Time difference} = \frac{90}{15} = 6 \text{ hours} \]
Nigeria lies east of Los Angeles, so its time is ahead; we add 6 hours:
\[ 8{:}00 \text{ p.m.} + 6 \text{ hours} = 2{:}00 \text{ a.m.} \]
Nigerian fans should switch on their televisions at 2:00 a.m. (the following day).
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