How many hours of direct sunlight comes from north of the east west line? Answered
We all know that the sun rises in the east and sets in the west. And it is true 2 days a year! The other 363 days it is untrue. I found a neat little website sollumis.com that gives a visual representation of the sunlight at any day of the year and at any location and in summer quite a lot comes from the northeast and northwest in the mornings and evenings. (where I live at about 49 degrees north).
I thought the rays represented 20 minutes of sun travel originally but now I am not so sure because the hours of daylight in a day do not correspond with the number of degrees of sunlight. Does anybody know how fast the sun goes down? Does it appear to speed up as it goes down in summer or does it appear at its fastest around noon? If it goes down faster than it goes at noon then there will be less hours of sun north of the east west line but if it goes slower, there will be more hours of sun north of that line.
I would like to know how many hours of light come from north of the east west line so that I can give a guesstimate about how much more light my lean away greenhouse collects compared to a lean to. The various websites are good for giving the sun up and sundown times and angles but none I have found give the corresponding times for the sun passing the east west line in morning and evening.
It is a tricky question and I can make a physical model to figure it out but maybe someone already knows the answer.
In the diagram the sunrise is 5.11 am and sunset is 9.17 pm and the sun rises at 52 degrees and goes down at 308 degrees. The degrees divided by 360 do not tally with the hours divided by 24 0.67 for the hours and 0,71 for the degrees.
Thanks for any help