Q10 of 40 Page 1

On which day would the sun appear at the highest point in the sky?

During solstice, the tilt of the earth's axis is pointed most directly towards or away from the sun. The summer solstice for the northern hemisphere occurs within a few days of June 21 every year. It is on this day that the position of the sun in the sky at noon is at its highest altitude of the year. The position of the sun at the sunrise and sunset is farthest on this day. Hence on 21 June, the sun appears at the highest in the sky.


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8

In present times, what are the instruments used for time measurement?

 9

At the poles, sunrise occurs on one equinox and sunsets on the next equinox. If you happen to be at any of the poles during this time, then what would be the route of the sun in the daytime?

 11

We have studied that the local time is different in different parts of the world. The daily routine of the people there is determined according to the local time in those places. Figure 1.3 shows the local times of different longitudes. Study this map and answer the following questions. Use the relationship between degrees and time for this.

A) Between which longitudes do the region experience daytime?


B) Which longitudes experience noon and midnight respectively?


C) Edward from New Orleans is on which longitude?


D) What is the time at Accra city?


E) At the same time, what is Sharad from Patna and Yakaito from Japan doing? What time is it in these cities?


F) Select any one longitude. Calculate the local time of the longitudes lying 1° to the west and east of this longitude.


 12

What is the maximum number of local times that can there be in the world?