Whichis India’s equivalent of the Greenwich Meridian?
Currently the world follows Greenwich meridian (0°longitude) is the International Standard Meridian or Prime Meridian and the world timing is related to the time at Greenwich. Life on Earth and its day night schedule is based on the rays from Sun. We all know that rays of sun oscillate between the two tropics- Tropic of Cancer and Tropic of Capricorn. Both the tropics are the northern and southern extremes where sun rays can be parallel at noon during the respective solstice. Greenwich has no astronomical significance as it is neither on the tropics nor on the equator.
Dongla is significant in this sense, that it lies on the intersection of the Tropic of Cancer and local longitude which was our ancient Indian Time meridian and the sun rays are exactly perpendicular during summer solstice.
Find out about other such observatories.