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The objective behind the construction of these observatories was to assemble astronomical data and to accurately predict the movement of the planets, moon, sun, etc. in the solar system. It was a one of a kind in its time when it was built. By the year 1867, when India was under the British Raj, the observatory had undergone considerable decay. [3]
The instrument can be used with an accuracy of about 20 seconds by a skilled observer to determine the time of day, and the declination of the Sun and the other heavenly bodies. It is the world's largest stone sundial, and is known as the Samrat Yantra. [1] [2] The Jaipur Jantar Mantar is a UNESCO World Heritage Site. [3]
A tithi (Sanskrit: तिथि) is the time taken by the Moon to advance 12° with respect to the Earth-Sun axis. [6] In other words a tithi is the time taken for the Moon's elongation (on the ecliptic plane) to increase by 12°. A tithi is one fifteenth of a pakṣa and one thirtieth of a cāndramāsa.
The season occurs based on tropical sun (without ayanamsha). The Earth revolves around Sun with a tilt of 23.44 degrees. When the tilt is facing the Sun it is defined as summer and when the tilt is away from the Sun it is called winter. That is the reason when there is summer north of the equator, it will be winter south of the equator. [9]
Dakshinayana (Sanskrit: दक्षिणायन, romanized: Dakṣiṇāyana) [1] is a Hindu astronomical concept that refers to the movement of the sun to the south of the equator, [2] [3] and is also a term that indicates the six-month period between the summer solstice and the winter solstice.
Features include locations of the sun and moon in the zodiac, Julian calendar, Gregorian calendar, sidereal time, GMT, local time with daylight saving time and leap year, solar and lunar cycle corrections, eclipses, local sunset and sunrise, moon phase, tides, sunspot cycles and a planetarium including Pluto's 248-year orbit and the 25 800-year ...
Tithi - Ending Moment (EM) of elongation of the Moon, the lunar day, the angular relationship between Sun and Moon ( Apparent Moon minus Apparent Sun). One Tithi equals 12 degree difference between Moon and Sun. Nakshatram - EM of asterism of the day, that is, the stellar mansion in which Moon is located for an observer at the center of the ...
At the time of the summer or winter solstices, the Sun is 23.44° degrees above or below the horizon, respectively, irrespective of time of day. Whilst the Sun is up (during summer months) it will circle around the whole sky (clockwise from the North Pole and counter-clockwise from the South Pole), appearing to stay at the same angle from the ...