Q: What is Indian standard time what is its importance

IST is a meridian of longitude. It is at a distance of \$82.5^{\circ} \$ from the Greenwich towards the EAST. It passes through ALLAHABAD which is the approximate centre of India.IMPORTANCE:This meridian of longitude (82.5°E) is 5 and a half hours ahead from the time at Greenwich. India has the IST as it's standard time because if it wouldn't have been there, the country would have difference of \$2\$ hours (as India is a large country and has a large East-west extent --- there's a difference of \$2\$ hours from Gujarat in the west to Assam in the east). Hence, IST is an important meridian of longitude.

Question 1

Why is it 5:30pm in India & 12:00 noon in London ?

Accepted Answer

In London, the Greenwich Mean Time (GMT) is followed. The Indian Standard Meridian is located $82\,1/2^\circ$ east of the Prime Meridian. Thus the Indian Standard Time (IST) is 5 hours and 30 minutes ahead of GMT. That is why, when it is 12 noon in London, it is 5.30 P.M. in India. As we know the earth rotates form west to east the sun rays first fall on the eastern most longitudes.  so, the countries which are on the eastern side of Prime meridian are ahead of it whereas western parts of Prime Meridian are behind it.

Question 2

What planet is closest to the moon?

Accepted Answer

Our moon orbits Earth, so Earth is closest to the moon at about $ 384,000 $. Other than Earth, the closest planet would be Venus at about $ 38 $ million km away.

Question 3

Distinguish between Weather and Climate.

Accepted Answer

Weather: Weather is a day-to-day conditions of atmosphere at any place in regard to temperature, pressure wind, humidity and rainfall.Climate: Climate is the average state of weather for a longer period  of time at any place. Weather records of a minimum period $35$ years are found necessary to obtain reliable average.

Question 4

Variations in the length of day time and night time from season to season are due to _______.

Accepted Answer

Variations in the length of day and night time from season to season on the earth's surface is due to the axial tilt of earth's rotation axis with respect to its orbital axis. This causes variations in the intensity of Sun's rays falling at a given place over the span of a year leading to variations in day and night time.

Question 5

What is the parallax formula and how is it used to calculate the distance between two stars?

Accepted Answer

The parallax formula states that the distance to a star is equal to $1$ divided by the parallax angle, $p$, where $p$ is measured in arc-seconds, and $d$ is parsecs.$d=\dfrac{1}{p}$Explanation:Parallax is a method of using two points of observation to measure the distance to an object by observing how it appears to move against a background. One way to understand parallax is to look at a nearby object and note its position against a wall. If you look with just one eye, then the other, the object will appear to move against the background.Because your eyes are separated by several centimeters, each eye has a different perspective of where the object is relative to the background. The closer the object is, the more it appears to move relative to the background. This is true in astronomy as well, but on a much larger scale.In astronomy, the distances to other stars is too great to measure using two objects on the Earth's surface. Lucky for us, the Earth itself moves. If we made two observations of the same star on opposite sides of the Earth's orbit, we would have a separation of $2$ astronomical units, or $AU$. One $AU$ is the average distance from the Sun to the Earth.This is enough to get a noticeable angle $\alpha$, between the star's two apparent locations. IN the image above, we can see that by cutting $\alpha$ in half, we get a right triangle where one leg is the distance the sun and the other star. Lets let $1/2\alpha=p$. We can $\tan p$ to find distance to that star.$\tan p=\dfrac{1\ AU}{d}$Since the star will be very far away, we can make the assumption that $\tan p$ is about equal to $p$. That simplifies our parallax formula to;$p=\dfrac{1\ AU}{d}$, or in other words, $d=\dfrac{1\ AU}{p}$Astronomical units are not the most convenient units to work with, though, so instead we define a parsec to be the distance to a star that shows $1$ arc-second of parallax angle. Our formula then becomes;$d=\dfrac{1}{p}$ parsecsWhere $p$ is measured in arc-seconds $1$ parsec is about $3.3$ light years.

Question 6

The colour of a star is an indication of its ________________.

Accepted Answer

The color of a star mostly indicates a star's temperature, and it can also suggest the star's age. Class O stars, which are blue in color, are the hottest, and class M stars, which are red in color, are the coldest.

Question 7

What is exact time now for GMT 5:30

Accepted Answer

Answer10:46 p.m. for GMT 5:30

Question 8

What is Indian standard time what is its importance

Accepted Answer

IST is a meridian of longitude. It is at a distance of $82.5^{\circ} $ from the Greenwich towards the EAST. It passes through ALLAHABAD which is the approximate centre of India.IMPORTANCE:This meridian of longitude (82.5&#176;E) is 5 and a half hours ahead from the time at Greenwich. India has the IST as it's standard time because if it wouldn't have been there, the country would have difference of $2$ hours (as India is a large country and has a large East-west extent --- there's a difference of $2$ hours from Gujarat in the west to Assam in the east). Hence, IST is an important meridian of longitude.

Question 9

What is the importance of international date line?

Accepted Answer

International Date Line is very important. As we know that it is drawn in a zigzag manner because it deviates at places on map so that it does not cut through any island or cause confusion of dates in country.

Question 10

The latitudinal differences in pressure delineate a number of major pressure zones, which correspond with

Accepted Answer

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