The diagrams in the Wikipedia article are a good visualization how every day on such a planet would look like click to enlarge :.
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This graph would have the same shape as the previous one, but not if we look at percentage change. At higher latitudes the length of day changes quite noticeably in early January and mid-November. In some situations two adjacent days are different in length by nearly five minutes, and at some points the day loses nearly fourty minutes over the course of a single week.
I just got excited after seeing this post here. That sounds great to know statistically that what is the rate of change of day length with latitude. Thanks, always wanted to know this. But can you explain WHY the rate of change is faster either side of the winter solstice also the curious shape of the curve mid spring and mid autumn?
Answer must be topological. In other words, the graph you allude to ought to be a graph of the first derivative, not an identical graph. This happens when the absolute change is small, which means the two effects are somewhat at odds, leading to the seemingly strange shape of the graph.
So since as an offset from 12 hours summer days are longer than winter days are short a careful inspection of the first graph reveals this the percentagewise change will be even more perturbed. The first effect is very dominant at higher latitudes. Can I edit that? Geometry is math. What I meant was arithmetic or algebraic reasons vs geometric. This is interesting. The asymmetry of the 2nd graph is not intuitive.
I think Toby provides an explanation. It would be helpful to have a graph of time delta, not as a percent, as well. Thank you. The exact graph I was looking for to show that at about the first week of February the sun speeds north and days lengthen at a quick and steady rate.
Areas on the Equator have a constant 12 hours of day light all year round. In summer, the regions north of the Arctic Circle enjoy between one and two months of Midnight Sun — 24 hours of sunlight due to the relative tilt of the Earth towards the Sun.
It is the opposite below the Antatarctic circle South Pole. In winter, the regions north of the Arctic Circle experience a hour period when the sun never rises above the horizon. This is known as the Polar Night. Again it is the opposite below the Antatarctic circle South Pole.
Good dates to investigate are the Solistice , June 21st the longest day in the northern hemisphere and the shortest day in the southern hemisphere and December 21st the shortest day in the northern hemisphere and the longest in the southern. This spinning of Earth like a top explains our daily cycle of night and day.
Between summer and winter solstice, the number of daylight hours decreases, and the rate of decrease is larger the higher the latitude. The fewer sunlight hours the colder the nights.
How fast Earth spins determines the number of hours in a given day. As Earth orbits the sun it spins about its axis approximately once every 24 hours.
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