The table shows the duration of sunshine for several geographical latitudes in a year
Lat RSP NRP NRNP 00 265331 262792 262800 05 265450 262895 262904 10 265585 263006 263013 15 265752 263116 263122 20 265951 263232 263241 25 266187 263355 263361 30 266469 263490 263501 35 266816 263643 263653 40 267247 263817 263828 45 267798 264025 264034 50 268529 264274 264287 55 269564 264602 264615 60 271217 265056 265072 65 275133 265818 265843 70 275489 267134 267157 75 274749 267763 267782 80 274578 268110 268128 85 274517 268367 268384 90 274529 268408 268426 Lat : latitude north RSP : taking into account the atmospheric refraction, the semidiameter of the Sun and the solar parallax. (blue curve in the image) NRP : geometric for Sun's center, without refraction, with parallax (red curve in the image, pratically the same of green curve) NRNP : same but without parallax (green curve in the image)
