Where Do The Lengths Of Daylight Change The Most Over The Year?
How does the length of the twenty-four hours vary from i day to the side by side throughout the twelvemonth?
January xi, 2011
Past Nick Lomb
The change from i day to the next in the length of daylight durind 2011. Graph and adding Nick Lomb
The length of the twenty-four hours is the interval between sunrise and sunset. Nosotros accept discussed in a previous post how that varies during the year. Briefly, days are longest at the time of the summertime solstice in Dec and the shortest at the winter solstice in June. At the two equinoxes in March and September the length of the day is well-nigh 12 hours, a hateful value for the year.
Permit united states of america at present ask what is the change in the 24-hour interval length from mean solar day-to-twenty-four hour period? You may have noticed that the time of dusk since 2 January has not changed so far and volition not change for a few more days until Fri xiv January 2011. The time of sunrise has been becoming subsequently by about a minute each day so that the length of the day has been shortening accordingly.
The diagram above makes things clearer. The alter from i day to the side by side at the time of the summer solstice in late Dec is around naught. Similarly, there is little change from day-to-day at the time of the winter solstice in June. This is not surprising as solstice means 'the twenty-four hour period the Dominicus stood withal', and then at those two times of the year we look piddling alter from day-to-mean solar day.
There is more change at the time of the equinoxes – autumn and spring – in March and September respectively. At those times the changes day-to-24-hour interval can exist up to iii minutes.
The curve above is surprisingly messy and not the smooth curve that would be expected. The probable explanation is that it is due to the rounding to the nearest minute in the calculation of sunrise and set times. If they were calculated to the nearest second and so the curves calculated from them would exist smoother. However, there is no indicate in giving sunrise and set up times to whatever college precision than a minute every bit atmospheric conditions each solar day tin can brand the bodily times vary slightly from the calculated times.
Source: https://www.maas.museum/observations/2011/01/11/how-does-the-length-of-the-day-vary-from-one-day-to-the-next-throughout-the-year/
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