At what time the sun is nearest to earth?
472046
Perihelion (nearest to earth) this year is July 3rd, Aphelion (furthest away from earth) was January 4th. The orbit is an ellipse.\n\nThe seasons are not caused by the orbit being elliptical but by the tilt of the earth's axis. So whichever hemispehere's summer it coincides with is coincidental and not a consequence of the distance from the sun varying throughout the year..\n\nNor does the sun being highest in the sky at mid-day have anything to do with the distance it is from the earth. It does not recede in the afternoon and approach nearer again the next day as seems to be implied.\n\nThere is one perihelion and one aphelion per orbit ie per year.\n\nHere's the next 6:\n\n2007                        \nPerihelion  Jan   3 \nAphelion    July  7 \n\n2008                       \nPerihelion  Jan   3 \nAphelion    July  4 \n\n2009                        \nPerihelion  Jan   4 \nAphelion    July  4 \n\nThe corresponding words for the moon's elliptical orbit round the earth are Perigee and Apogee. There is one of each every lunar month.  Here are the next 5\n\nPERIGEE Apr 25 363735 km  \nAPOGEE May  7  404571 km   \nPERIGEE May 22 368614 km\nAPOGEE Jun  4  404079 km  \nPERIGEE Jun 16 368925 km\n\nDistances are from the centre of the earth to the centre of the moon
691886
Do you mean one hour relative to someone standing still?  You would return 214,000 km away from the Earth.  This is assuming you travelled exactly one hour back.  The Earth would have moved in the 2 hours you were away.  Since the earth revolves around the sun at 107,000 km/hr, you would be 214,000 km away.
449066
Besides the sun, Proxima Centari is closest.  About four light years away.  (only visible from the southern hemisphere though).  Actually Alpha Centauri is a three-star system.  Alpha Centauri -C is the closest of the three to earth.
787984
Not as long as the earth's axis remains tilted at 23° 27’ (lets call this 24°) with respect to its orbit plane around the sun. \n\nThat is why any part of the earth north of  66° lattitude (= 90°- 24°), the Arctic Circle,  is exposed to the sun all 24 hours in the summer when the earth is leaning toward the sun. This is called the "midnight sun".\n\nHope this helps!
651836
It is definitely the sun. Alpha Centauri is nearly 4 light years distant. The sun is nearly 8 light minutes distant.
874489
Earth's average distance from the sun is a little bit under 93 million miles. The closets the Earth gets to the sun is about 90 million miles and the farthest is about 96 million miles.
542914
There are two ways to answer your question - \n\nThe orbit of Venus is closest to the orbit of Earth.\n\nHowever, depending on the current positions of the planets in their relative orbits... Mars or Mercury could be closest to Earth.\n\nToday, it appears that Venus is the closest planet.\n\nTwo months from now, Mercury will be the closest planet to Earth.\n\nSee the attached link for a pretty nifty orbit simulator from the NASA /JPL website.
1020238
Right ascension and declination are just like longitude and latitude, but in the sky instead of on Earth. The stars are fixed on this grid, so if you know the right ascension of any star then you can measure from that star to any other point. If you want to know the right ascension of the meridian at your location, or the hour angle of the vernal equinox, which is 0hr, you need to know the local sidereal time. The US Naval observatory has an online calculator. Of course local sidereal time is changing continuously as the Earth rotates, so at the moment you determine the local sidereal time you need to start a clock and later add whatever that clock says to the value you originally got to have the current local sidereal time. Also, the clock should really be a sidereal clock and not a solar clock, because a solar day is 24 hours but a sidereal day is only 23h 56m 4s, although a regular solar clock is probably good enough for a few hours. The difference is due to the Earth's orbit. Earth rotates once in 23h 56m 4s but in that time it has moved around the Sun enough so that it needs to rotate another 3m 56s to bring the Sun back to the same altitude in the sky. Another way to look at it is that the sun moved 3m 56s in right ascension during the day.
20848
The distance between the earth and the sun is not constant.  The earth's\norbit around the sun is nearly circular, but not perfectly so.  The earth\nis actually closest to the Sun in the northern hemisphere winter, but the average distance between the earth and the sun is 93,000,000 miles.
194179
The distance from the earth to the sun is about 93 million miles. The speed of light is about 186,000 miles per second. Dividing shows that it tkes light about 500 seconds to go from the sun to the earth. That's 8 minutes 20 seconds.
842146
Well the earth orbit's the sun \n2AU * PI / year\n\nAn AU is the average distance of the Earth from the sun in it's orbit.  Although all orbit's are ellipses, the equation of a circle should approximate close enough.\n\n1AU =149.598×10^6 km.\n2AU = 299196000 km \n\nThe earth moves really fast so we should convert years into seconds.  The earth orbits the sun once about every 365.25 days (the .25 is why we have leap years).\n\n365.25 * 24 * 60 * 60 = 31557600 seconds.\n\nSo now all we must figure out to get the speed in km/sec we calculate \n(299196000 * PI) / 31557600\n=29.785280109497\n\nSo the Earth orbits the sun at a speed of 29.785280109497 km/sec.  That's pretty fast!\n\nWikipedia gives a max orbital speed of 29.783 km/sec and a min orbital speed of 29.291 km/sec, so my estimate was pretty darn close.
328347
The earth's orbit is not circular so at some times of the year the earth is travelling more quickly. So sunrise and sunset times vary at the equator. In fact the earliest sunset is at the middle of November and the latest sunrise is at the begining of February. In temperate regions this effect is overwhelmed by the effects due to the tilt of the earths axis.
687280
Not counting the sun, the closest star to earth is Proxima Centauri, which is about 4.1 light years away from the earth. Light travels at 300 000 km/s so you can now use this to calculate the distant. 4.1 light years x 365 days per one light year x 12 months per 1 year x 30 days per one month, x 24 hours per one day x 60 minutes per one hour x 60 seconds per one minute = 4,654,713,600 seconds. Multiply this figure by 300 000 km/s and you get an answer of 1,396,414,080,000,000 Kilometers.
32702
CLOSEST?? to the sun?\nThat would be Mercury....
787978
Hi, \n\nThe sun's orbit is 365.4 days. The actual length changes very little, but with a period of roughly 41,000 years.\n\nHope that helps, \nMatt
384258
About 92.9 million miles on average. This is also 147 million kilometers. The actual amount varies over time because the earth's orbit isn't a perfect circle. In astronomical terms, this is *very* close. If you made a scale model with the distance from the earth to the sun as 1 inch, then the distance to the nearest star (other than the sun) would be 4.3 *miles*.
7779
Distance From Sun is: 93,000,000 Miles