Observations by SPACE in INDIA


We are familiar with the mythological story of the three steps that Vishnu took. In his avatar as Vamana his first step covered the earth, the second the sky the third was on King Mahabali's unfortunate head | Interestingly this story is immortalized in stone in a temple in Kanchipuram. The deity there is called Ulagalanda Perumal, in Tamil, which translates as "the Lord who measured the world"! This bug, to measure the world, also bit humans. The human quest for measuring our universe is one of the most fascinating chapters in the history of science. A different type of observation is needed at every distance range. In each range, the distance measurement is used as a step in the ladder to measure distances in the next (larger ) distance range. Collectively, these steps form the Cosmic Distance Ladder that reach out to the very edge of the known universe. The distance from the earth to the sun, called the Astronomical Unit (A.U.), lies at the lowest rung of the ladder and is therefore a most fundamental measurement.

Phase 1 :
We measure the Size of the Earth just by the simple use of Gnomon with base, a plumb
line and accurate map of India. Just required little bit preparation at open site where
sun is visible at 11a.m and 1 pm. Then we measure the ratio of radii of the Earth and Venus.
The angle between the sun and Venus as viewed from the earth at any instant is called
the elongation of Venus at that instant. Now by measuring the angle (elongation)
continuously we can immediately determine the ratio of the radii of Venus and Earth.

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Phase 2 :

Parallax refers to the apparent shifting of an object when viewed from different
angles. Here we will just Measure the Parallactic shift by The method of Chords or by
the Halleys Method.

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Phase 3 :

Observations on Transit Day

For this rare event we can’t afford any single mistake by which we will miss this
opportunity. We need to prepare the telescope accordingly with the team of at least 4
members and with observation sheet.

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