The sun is big at rising but cold. But at noon it is small and hot.If the distance is shorter in the morning why it is not hot? If the distance is more at noon why it is more hot than morning?
199805
As the light from the sun enters the atmosphere, the atmosphere bends it a certain amount. Because the sun is closer to the horizon at sunrise and sunset, there is more atmosphere to bend the incoming light rays. Hence, the sun appears larger at sunrise and sunset because of atmospheric lensing.
319104
Heat energy from the sun travels through radiation, as opposed to convection and conduction.
507357
On average the sun moves about 1 degree against the background stars per day (that's about 2 full moons!).  Since the Earth is on an elliptical orbit, we actually speed up and slow down, so it changes from day to day the exact amount.  \n\nIf you mean how many degrees above or along your local horizon, you need to give me your latitude and longitude to answer that.
585420
It's daytime, because of physics. \n\nTo make this simple, just think that since water takes longer to heat than the earth, the air over water is cooler than the air over land. There's some physics law that says everything will reach an equilibrium in temperature. So, the air above will ocean will be moving towards the land to try to equalize. \n\nIn contrast, at night, the air over land cools faster than the air over water. Thus, the breeze goes into the sea. \n\nGood luck!
382503
for every 15 degrees of longitude, there is essentially 1 hour difference in when the sun rises.  360 degrees/24 hours.   -  that set's up the time zones, basically.\n\nbut - it's not like the time just comes in 1 hour chunks :)\n\nevery degree on longitude is roughly 4 minutes away (sunrise, sunset...that is) from the next degree.  and in there....15 arc-minutes (1/4 degree) = 1 minute.   and so on. :)\n\nand...since the earth is constantly revolving, but we assign the same "local time" to a huge swath of the earth. - every spot on the earth sees the sun rise at a different moment as measured by "local time".\n\n:)
177151
because of the distance and variations of the surface temperature of the sun, plus the infrared spectrum within the sun, sun spots appear darker.Photvoltiac activity is contained within or under the suns surface, thereby hidden from our view, but detected via spectrum analyzers
69324
It is Olbers' Paradox.\n\nWhy isn't the night sky as uniformly bright as the surface of the Sun?  If the Universe has infinitely many stars, then it should be.  After all, if you move the Sun twice as far away from us, we will intercept one quarter as many photons, but the Sun will subtend one quarter of the angular area.  So the areal intensity remains constant.  With infinitely many stars, every angular element of the sky should have a star, and the entire heavens should be as bright as the sun.  We should have the impression that we live in the center of a hollow black body whose temperature is about 6000 degrees Celsius.  This is Olbers' paradox.  It can be traced as far back as Kepler in 1610, and was rediscussed by Halley and Cheseaux in the eighteen century; but it was not popularized as a paradox until Olbers took up the issue in the nineteenth century.
302911
It all has to do with light being reflected & scattered before you see it.\n\nWhen the sun is directly overhead the light from the sun has less atmosphere to travel through so there is less interference & scattering. You see all colors of the visible EM spectrum together as white light. The sun itself is yellow; this is due to the fact that is a yellow star as opposed to a blue or red one. Yellow stars are medium temperature stars.\n\nHowever, when the sun is setting over the horizon, the light is traveling through more atmosphere. Because of this, there is more interference & scattering of the different wavelengths. You're eyes see the wavelengths that are reflected.\n\nAlso, during sunset, the light is reflecting off other stuff in the atmosphere like pollution & dust particles. Since it is traveling through more atmosphere there will be more particles to get through before it actually gets to your eyes.\n\nDepending on the types of particles in the air, the sunset will be different colors. The link below will give you more information on why sunsets are different colors.
420144
A fundamental axiom: cold air is heavier than warm air.\n\nThus, cold air sinks (like into a valley) and hot air rises.\n\nHowever, the temperature gradient (how temperature changes with increasing altitude) is negative.  This means air gets colder as altitude increases.  So what we have is cold air at altitude pushing down on warm air near ground level.\n\nThe warm air heat comes from the ground, which is heated by our Sun.  In summer, there is a lot more of that solar energy to heat the ground and lower air in the valley than in winter.  Thus, the valley air is warm.  In fact, the weight of the colder upper air contributes a little bit to the heat below because a gas under pressure does heat up.  But in winter, when there is far less solar energy and resulting heat, the naturally colder air above settles into the valley.  \n\nBoth the cold and warm air are more or less trapped in the valley because of the hills or mountains surrounding it.  Thus, the cold air stays colder because no warm air is blown from the surroundings into the valley.  And the warm air stays warmer because no cold air is blown into it.
154116
The Earth is tilted by 23 1/2 degrees. During the Summer months, the north is pointed toward the Sun allowing more direct sunlight. During the winter, we are tilted away from the sun so the sunlight is more indirect as the sun seems lower in the sky. There are 4 cardinal points in our calender; Summer solstice, autumnal equinox, winter solstice and vernal equinox. Beginning of summer, fall, winter and spring. This coincides with the position of earth as it goes around the sun. Each of the cardinal days can take place over a three day period, 20th, 21st, 22nd. On June 20th, summer solstice, it is the longest day of the year. It is also the day that the north pole is pointing directly at the sun. The next day it will have passed this point and start pointing away from the sun, hence, the days will also start getting shorter. For further info, feel free to email me, orion_1812@yahoo.com
22568
Actually, the Earth does move ever so slightly closer and farther from the sun at different times of the year. However, this is not what causes the change in temperature. The change in temperature is mainly caused by the tilt of the earth towards or away from the sun. So, for us in the Northern Hemisphere....during the winter, the northern axis of the earth is tilted slightly away from the sun. This means that the suns rays during the day are less direct on this part of the world. It's also why the sun seems to always be in your eyes during winter driving. It never rises far above the horizon.
8669
shorter ... im not sure what you put as the last letter is right.  In the summer the angle that the earth is tilted makes the shadows (in the northern hemisphere) SHORTER than in winter.
652205
One question at a time.\n\nThe first one has been answered. Becasue of the earths tilt, countries in the southern hemisphere are closer to the sun in December than the countries in the northern hemisphere - that is why we have winer here (its further away). And when the earth goes around to the other side of its orbit around the sun in July, we in the northern hemisphere are closer, while they are farther. \n\nThis the general rule, however there are many other factors like elevation, precipitation, wind patterns, jet streams, ocean currents etc etc. so yes - every country in the northern hemisphere it is officially summer in july etc. but not necessarily as warm as some other countries can get. and vice versa for the southern hemisphere of course.\n\nAll of us - when we stand up, we are perpendicular to the earths surface no matter where we are. Imagine a ball ... and pins sticking straight out of the ball. This is how we'd look, so to a person on the south POLE, would be upside down to someone on the north POLE. or someone in one area, will be upside to someone else DIRECTLY on the other side the earth's surface. Everyone else will be in varying degrees of "upsidedownness"\n\nDaylight savings time is a pure man made concept. But again ... because of the tilt of the earth, during July etc. the sun shines longer on the northern hemisphere (The days are longer) and the southern hemisphere the days are shorter. This causes the sun to rise earlier and earlier and then after the longest day of the year, it reverses - the days get shorter and shorter. \n\nNow what happens is that you can wake up at 6 am and it still be pitch dark and 7 am it starts to rise and 8 am its fully light. So they change the time to go an hour back (Fall Back) and this allows the time now to be 5 am as pitch dark, 6 am start rise, and 7 am fully light. So for people who wake up at 7 am everyday, the first plan it will be kinda  dark when they wake up but with daylight savings, it will be fully light when they wake up! Thus its just something certain countries do to be able to have light for when most people wake up in the morning - even if you are not a mornig person - about 90% of people wake up at that time to to go to work\n\nHope all this made sense and email me at alxsml@yahoo.com for more clarification.
412831
in the northern hemisphere, above the equator, during winter the tilt of the earth spreads out the suns rays over a wider area, so there is less energy per square mile than in summer, that's why it's colder in winter. \n\nIt's colder up in the mountains because the air is thinner, and can hold less energy than the thicker air at lower elevations.\n\nThe earth's distance from the sun varies a bit through the year but it's not much of a factor in the temperatures.  Latitude (distance from the equator) and the seasons are the predominant reasons it's warm or cold.
413473
Because the earth's axis is tilted.\n\nIt is all about the tilt of the Earth's axis. Many people believe that the temperature changes because the Earth is closer to the sun in summer and farther from the sun in winter. In fact, the Earth is farthest from the sun in July and is closest to the sun in January! The Earth's movement around the sun causes the seasons, but it does not affect the temperatures during the seasons. \n\nDuring the summer, the sun's rays hit the Earth at a steep angle. The light does not spread out as much, thus increasing the amount of energy hitting any given spot. Also, the long daylight hours allow the Earth plenty of time to reach warm temperatures. \n\nDuring the winter, the sun's rays hit the Earth at a shallow angle. These rays are more spread out, which minimizes the amount of energy that hits any given spot. Also, the long nights and short days prevent the Earth from warming up. Thus, we have winter!
166668
(m)\n\nThe Sun's diameter is 864,938 miles (1,391,980 km). This is almost 10 times larger than the planet Jupiter and about 109 times as big as the Earth. The volume of the Sun is 1,299,400 times bigger than the volume of the Earth; about 1,300,000 Earths could fit inside the Sun \n\nAs compared to other stars, however, the Sun is about average; red giants like Betelgeuse are about 700 times bigger than our Sun (and roughly 50 times as massive). Betelgeuse is also about 14,000 times brighter than the Sun. Red supergiants dwarf the Sun. \n\nThe Sun's apparent size in our sky is 32 arc minutes (it is the biggest object in the sky - 1 arc minute larger than the moon). \n\nThe Sun's mass is roughly 1.99 x 1030 kg. This is about 333,000 times the mass of the Earth. The Sun contains 99.8% of all of the mass of the Solar System. \nThe mass of the sun is decreasing over time, as fusion reactions convert hydrogen into helium, releasing huge amounts of energy in the process
673201
Air is heated by the surface of the Earth on a Hot and sunny Day.  Hot air rises.  AS it rises it expands due to lowered atmospheric pressure.  As it expands it cools and begins to decend again.  Also if the air is moist as it cools it must release the moisture (rain -or hail if it is high and cold enough.)  This begins a circulation pattern up in the middle and down outside.  Often hail will begin to fall only to be caught in an updraft and carried aloft again.  This cycle continues until the hail is too heavy for the updrafts to lift it and it makes it to the ground.  This is why very strong thunderstoms with violent updrafts produce large hail.