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Right Ascension and Declination of Sun for 2021. 18 hours Universal Time corresponds to noon in the Central time zone of the United States when standard time is in effect. During the spring and summer months, and part of autumn it corresponds to 1 PM Central Daylight Time. The program that generated these coordinates uses algorithms taken from ...
The Sun. The Sun is currently in the constellation of Pisces. The current Right Ascension of The Sun is 23h 50m 46s and the Declination is -01° 00’ 02” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [ change ]). The current magnitude of The Sun is …
Table of the Sun's Declination Mean Value for the Four Years of a Leap Year Cycle Day JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 S23° 04' S17° 20' S7° 49' N4° 18' N14° 54' N21° 58' N23° 09' N18° 10' N8° 30' S2° 57' S14° 14' S21° 43' 2 S22° 59' S17° 03' S7° 26' N4° 42' N15° 12' N22° 06' N23° 05' N17° 55' N8° 09' S3° 20' S14° 34' S21° 52'
Apr 01, 2022 · Not all planets transit into the extreme declinations. The Sun will never appear beyond the maximum declination of 23 degrees 27 minutes. Mercury, Venus and Mars typically transit Out of Bounds once or twice a year. Jupiter is likely to go out of bounds every six years, but does not always. The graph at the bottom of the page is only for the ...
The Sun's Right Ascension can be found by measuring the Local Sidereal Time of meridian transit. We find that the Sun's RA increases by approximately 4 minutes a day, and its declination varies between +23°26' and -23°26'.
Since RA increases to the east, it follows that the Sun's RA has increased. Over the course of a year the Sun must move through 24h of RA to return to the same place, so the Sun's RA increases by roughly 2 hours a month.
Because there are 24 hours in a day, each hour of right ascension measured along the equator equals 1/24th of a circle (360° divided by 24) or 15°.
The Sun appears to be in constant motion—rising on one side of the sky, moving across the sky, and setting on the opposite side. This apparent motion across the sky is due to the rotation of Earth. … These two motions affect the Sun's changing position in the sky and the times of daily sunrises and sunsets over a year.Dec 23, 2021
RA (right ascension) and DEC (declination) are to the sky what longitude and latitude are to the surface of the Earth. RA corresponds to east/west direction (like longitude), while Dec measures north/south directions, like latitude. RA is indeed measured in hours, minutes, and seconds.
The declination of the north celestial pole is 90° 0' 0" and the south celestial pole's declination is -90° 0' 0". The equator is 0° 0' 0". The position of an object is stated with the right ascension first, then the declination. For example, the bright star Sirius' position is RA: 6h45m8.
Declination is analogous to latitude and is measured as north or south of the celestial equator. Declination is usually expressed in degrees, minutes of arc, and seconds of arc. Note that because right ascension is measured in time units, before performing calculations you need to multiply by 15 degrees/hr.
The declination of a star does not change with time. The hour angle does, and hence it is not a suitable coordinate for a catalogue. This problem is overcome in a manner analogous to the way in which the Greenwich meridian has been (arbitrarily) selected as the zero point for the measurement of longitude.
Right ascension (blue) begins at the March equinox (at right, at the intersection of the ecliptic (red) and the equator (green)) and increases eastward (towards the left).
We usually speak of the sun setting in the west, but technically it only sets due west at the spring and autumn equinoxes. For the rest of the year, the direction of sunset pivots about this westerly point, moving northerly in winter, and towards the south in summer.Oct 11, 2019
The Sun appears higher in the sky during the northern hemisphere summer, moving lower as we move into winter. The larger loop shows how the Sun's position changes rapidly between measurements. At that time of year the Earth is closer to the Sun and therefore travels faster around it.
The Earth's spin axis doesn't point at 90 degrees to the Sun. Because of this, the Northern Hemisphere is tilted towards the Sun in the Northern Hemisphere's summer and tilted away during the winter. This tilting causes the seasons.Nov 5, 2021
The declination of the Sun is the measurement of the angle between the Sun’s rays and the Earth’s equatorial plane. This principle is used to explain why we have different seasons, why there are four in some countries and there are only two in some. The Earth’s axis is tilted by 23.5 degrees away from the solar plane.
The northern hemisphere and the southern hemisphere have always contradicting seasons. When the northern hemisphere is tilted towards the Sun, summer season occurs while it becomes winter in the southern hemisphere.
With respect to the celestial equator, it reaches the highest altitude of 73.5 degrees and this occurs on the first day of the summer while its altitude reaches the minimum 26.5 during the first day of the winter. The Sun’s declination also affects the duration of the daylight. Again with respect to the celestial equator, ...
The Sun is currently in the constellation of Leo. The current Right Ascension of The Sun is 11h 09m 19s and the Declination is +05° 25’ 41” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [ change ]). The current magnitude of The Sun is -26.73 (JPL).
Here is a recent image of the Sun's surface showing the current sunspot activity:
Below we provide The Sun finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.
The distance of The Sun from Earth is currently 150,693,564 kilometers, equivalent to 1.007324 Astronomical Units . Light takes 8 minutes and 22.6596 seconds to travel from The Sun and arrive to us.
Between January 2013 and December 2100, the closest approach of The Sun to Earth happens on Sun Jan 5 2020 at a distance of 0.983244 Astronomical Units, or 147,091,188 kilometers:
Today's The Sun rise, transit and set times from Greenwich, United Kingdom [ change] are the following (all times relative to the local timezone Europe/London):
The following shows the known values of the most important physical parameters of The Sun. Source: JPL Small-Body Database