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This may address what you want; if it does not, please restate the question. They don't call it "equator" for nothin'. It divides the earth into equal (probably not down to the nearest molecule) hemispheres, north and south. It is also the mid-way mark between the 'poles', north and south. Yes, that is obvious. When it is summer in the north, the north pole receives sun around the clock, and the south pole is in darkness around the clock. Six months later, the light situation is reversed. We also know that during the summer in the temperate zones, daylight lasts longer than night time. The Big Question is: Will the lengths of daylight and night time change at the equator throughout the year the way it does for the poles and for the temperate zones? No, it really doesn't. The equator represents a kind of 'averaging' of daylight and night time for the north and the south. If you live on the equator, you may never have summer sunlight until 8, 9 or 10 pm the way you would in other parts of the globe, but you will also never have shorter or non-existent periods of sunlight. The movements of the earth aren't quite as simple as we can easily imagine from playing with globes; for example the orientation toward the sun of the earth's poles is not most pronounced at the moments of perihelion and aphelion. Learning this was a mind-blowing revelation for me. There are also some subtle changes in earth's orbital velocity because of our elliptical orbit. But our rotational, or axial velocity is virtually constant. So we probably cannot say that sunrise and sunset are always precisely, down to the smallest fraction of a second, at the same times every day at the equator. But the differences are minor and far too small to experience in any direct way.
No matter what part of the year it is, no matter where in its orbit the earth is and no matter where the earth's rotational axis is pointing with respect to the sun, about half of the equator is always exposed to sunlight.
(edit) There are only two days every year when an equatorial day has nearly equal durations of light and dark. Most succinctly, this is timed from the instant when the Equatorial Disk crosses the Ecliptic Disk.
Some may choose to put it that this is the instant at which transit of the Sun from the Northern Hemisphere to the Southern Hemisphere, or the other change of seasons, when it moves from the Southern Hemisphere to the the Northern takes place. The Equator is in fact an imaginary line of infinitesimal thickness and so, although the apparent transit of the Sun is allocated a 24 hour period, it is a fact that the transit time in extremely swift and will rarely occur in the same geographical position East or West of Greenwich each year. This means that equality of day and night is only approximate.
The whole of this explanation is governed by the fact that the Equatorial Disk and the Epileptic Disk are set at a fixed angle of twenty three and a half degrees to each other. The same angles that the Tropic of Capricorn and the Tropic of Cancer make with the Equator measured from the centre of the Earth. The Tropic of Capricorn, being the most Southern excursion of the Sun before reversing, while the Tropic of Cancer is the most northern excursion.
Yes, it does. Which, precisely, depends on what season it is, and which direction you move.
Except at either of the Equinoxes, when it doesn't.
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Which hemisphere has the longest day length in June?
Antarctica
Do the length of days change on December 21st?
The length of daylight changes every day. In the northern hemisphere, having been getting shorter every day for 6 months, they start getting longer from December 21st. In the southern hemisphere, having been getting longer every day for 6 months, they start getting shorter from December 21st.
What does the spring equinox mean?
In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.
In between September 23 and December 22 do days become shorter or longer?
Days get `longer` between June 21st and December 21st for the southern Hemisphere, while they get shorter for those in the northern hemisphere. Between December 21st and June 21st, the days get longer for those in the northern hemisphere and shorter for those in the southern hemisphere.
Which is the longest day in northern hemisphere?
The first day of summer is the longest day in the northern hemisphere. The first day of winter is the shortest.
Which hemisphere has the longest day length in June?
Antarctica
What is the last day of summer in the northern hemisphere?
The last day of summer in the northern hemisphere is typically September 22nd or 23rd. This is known as the autumnal equinox, when daylight and darkness are nearly equal in length.
How long does the equinox last in northern hemisphere?
The equinox in the northern hemisphere typically lasts for one day, occurring around March 20th or 21st. During the equinox, day and night are approximately equal in length, marking the beginning of spring in the northern hemisphere.
What occurs on the vernal equinox?
Across the whole planet the day and night length are the same and it is the first day of Spring in the northern hemisphere and the first day of Autumn in the southern hemisphere.
What is the day of length in June?
In June, the length of the day varies depending on your location. In general, the day is longer in the Northern Hemisphere due to the summer solstice, which falls around June 21st. In the Southern Hemisphere, the day is shorter during this time.
May 15 gaining or losing time each day?
If May 15 gains time each day, it means the days are longer than 24 hours. If May 15 loses time each day, it means the days are shorter than 24 hours. However, in reality, the length of a day remains constant at 24 hours due to Earth's consistent rotation.
Do the length of days change on December 21st?
The length of daylight changes every day. In the northern hemisphere, having been getting shorter every day for 6 months, they start getting longer from December 21st. In the southern hemisphere, having been getting longer every day for 6 months, they start getting shorter from December 21st.
What is the length of day in northern hemisphere in march?
The length of day in the northern hemisphere in March varies depending on the specific location. Near the equator, the day and night are approximately equal in length. However, as you move towards the poles, daylight hours increase significantly, with locations near the Arctic Circle experiencing 24 hours of daylight during the summer months.
When does the fall equinox occur in the northern hemisphere?
The fall equinox occurs around September 22 or 23 in the northern hemisphere. This marks the beginning of autumn when day and night are roughly equal in length.
What does the spring equinox mean?
In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.In the northern hemisphere it is the 21st of March. In the southern hemisphere it is the 21st of September.
What month contains the shortest day in the northern hemisphere?
All days are the same length. Except in the polar zones, each day is characterized by some period ofsun-up, and the rest of the time sun-down.In the northern hemisphere, the longest period of sun-up occurs in June, on the day of the Solstice.
Why Does the length of day increase?
The length of day increases during the summer months in the Northern Hemisphere because Earth's axis is tilted toward the sun, causing the sun to be above the horizon for a longer period of time each day. This results in more daylight hours and longer days.
