What will be the altitude of the sun on 21 June at :a)equator b) 66½

1.	What will be the altitude of the sun on 21 June at :a)equator b) 66½ N c) 66½S d) 23½
Answer» What's special about 21st June? In the question, we are GIVEN with this date only because this day is known as Summer solstice when the northern hemisphere will have its longest day and shortest note. March 21st and September 23rd are known as equinoxes because they have EQUAL days and equal nights in all places of EARTH. After the March equinox, the sun appears to move northwards of the earth and is vertically overhead of Tropic of Cancer(23.5° N) on 21st June. (Summer solstice) By December 22nd, the sun is overhead of the Tropic of Capricorn when Southern hemisphere will have its longest day and shortest night. (Winter solstice). So, We KNOW that Tropic of Cancer is towards 23° N of the equator and the sun rays will fall directly overhead of it. And we know that, (For Summer solstice) ⇛ Altitude = 90° - latitude + 23.5° ⇛ Altitude of sun = 90° - 23.5° + 23.5° ⇛ Altitude of sun = 90° (Max.) Hence the Altitude of sun on 21st June is: $\huge{ \boxed{ \red{ \sf{90 \degree}}}}$ And we are DONE !!

What will be the altitude of the sun on 21 June at :a)equator b) 66½ N c) 66½S d) 23½

Answer»

What's special about 21st June?

In the question, we are GIVEN with this date only because this day is known as Summer solstice when the northern hemisphere will have its longest day and shortest note.

March 21st and September 23rd are known as equinoxes because they have EQUAL days and equal nights in all places of EARTH.

After the March equinox, the sun appears to move northwards of the earth and is vertically overhead of Tropic of Cancer(23.5° N) on 21st June. (Summer solstice)

By December 22nd, the sun is overhead of the Tropic of Capricorn when Southern hemisphere will have its longest day and shortest night. (Winter solstice).

So,

We KNOW that Tropic of Cancer is towards 23° N of the equator and the sun rays will fall directly overhead of it.

And we know that,

(For Summer solstice)

⇛ Altitude = 90° - latitude + 23.5°

⇛ Altitude of sun = 90° - 23.5° + 23.5°

⇛ Altitude of sun = 90° (Max.)

Hence the Altitude of sun on 21st June is:

$\huge{ \boxed{ \red{ \sf{90 \degree}}}}$

And we are DONE !!

What will be the altitude of the sun on 21 June at :a)equator b) 66½ N c) 66½S d) 23½

What's special about 21st June?

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