Question

the greenwich mean times is 09h00. calculate the time at:
a)longitude 60 degree
b)longitude 150 degree

Answer 1

Explanation:

every 1° is equal to 4 minutes.

If it is on west of greenwich median than substract the calculated time from actual time of GMT and if it is on east than add.

69°E = 69×4 = 276 minutes i.e 4 hours 36 minutes.

time on greewich is 12:00 . so, time on 69°E is

12 +4 hr 36 min = 16:36

similarly in case of 30°west we have to substract the time i.e

12 - 2 hrs = 10:00

and for 12°E again add

12+48 min = 12:48

Hope this was helpful.

Answer 2

Your answer is given below =》》》

One can easily determine latitude. Any star will consistently reach the same highest point in the sky. Its height in the sky changes with the observer's latitude. This concept was known and widely used from very ancient times. In the Northern Hemisphere the North Star was/is a popular choice. The angle the North Star makes with the horizon (α in the figure to the right) is the same as the observer's latitude.

Thanku