[amp_mcq option1=”7 h 00 m” option2=”7 h 30 m” option3=”8 h 00 m” option4=”9 h 00 m” correct=”option1″]<\/p>\n
The correct answer is A. 7 h 00 m.<\/p>\n
The standard time at longitude 90\u00c2\u00b0 E is 8 h 30 m. This means that the Sun is at its highest point in the sky at 8 h 30 m at longitude 90\u00c2\u00b0 E. At longitude 82\u00c2\u00b0 30′ E, the Sun is at its highest point in the sky 15 minutes earlier, at 8 h 15 m. This is because the Earth rotates on its axis once every 24 hours, and there are 360 degrees in a circle. Therefore, the Earth rotates 15 degrees every hour. Longitude 90\u00c2\u00b0 E is 7 1\/2 degrees east of longitude 82\u00c2\u00b0 30′ E. Therefore, the Sun is 7 1\/2 hours ahead of longitude 82\u00c2\u00b0 30′ E.<\/p>\n
The local mean time at a place is the time that would be shown by a sundial at that place. A sundial shows the time by the position of the Sun in the sky. The Sun moves across the sky from east to west, so the time on a sundial increases from east to west. Therefore, the local mean time at longitude 82\u00c2\u00b0 30′ E is 7 h 00 m.<\/p>\n","protected":false},"excerpt":{"rendered":"
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