Estimation of Solar Insolation and Angstrom–Prescott Coefficients Using Sunshine Hours over Nepal

Table 1

Geographical locations and regression equations for measuring sites.

S. No.	Location	Latitude deg N	Longitude deg E	Altitude masl (meter above sea level)	Angstrom–Prescott model
1	Tikapur	28.5365	81.1151	149	Hg/Ho = 0.272 + 0.374 (n/N)
2	Nepalgunj	28.113	81.589	150	Hg/Ho = 0.255 + 0.451 (n/N)
3	Kankai	26.6583	87.8619	300	Hg/Ho = 0.004 + 0.654 (n/N)
4	Dharan	26.7929	87.2926	310	Hg/Ho = 0.291 + 0.407 (n/N)
5	Dipayal	29.2621	80.9369	662	Hg/Ho = 0.278 + 0.519 (n/N)
6	Dhunibesi	27.7229	85.1643	1085	Hg/Ho = 0.235 + 0.432 (n/N)
7	Darchula	29.8429	80.5388	1097	Hg/Ho = 0.234 + 0.592 (n/N)
8	Pulchowk	27.6816	85.3187	1320	Hg/Ho = 0.293 + 0.413 (n/N)
9	Khumaltar	27.6517	85.3257	1350	Hg/Ho = 0.271 + 0.448 (n/N)
10	Ilam	26.868	88.0783	1570	Hg/Ho = 0.198 + 0.543 (n/N)
11	Okhaldhunga	27.3081	86.5042	1720	Hg/Ho = 0.215 + 0.598 (n/N)
12	Lumle	28.2966	83.8179	1740	Hg/Ho = 0.261 + 0.541 (n/N)
13	Jiri	27.6304	86.2321	1877	Hg/Ho = 0.26 + 0.564 (n/N)
14	Musikot	28.619	82.4625	2100	Hg/Ho = 0.244 + 0.532 (n/N)
15	Jumla	29.2724	82.1935	2383	Hg/Ho = 0.28 + 0.553 (n/N)