Solar time angle at midpoint of the period (for periods < 1 day).
date-time object (e.g, POSIXct, POSIXlt or Date objects).
longitude of the measurement site (degrees east of Greenwich) (for periods < 1 day)
list for control parameters and empirical factors (see Details)
longitude of the centre of the local time zone (degrees west of Greenwich)
- 0 for Greenwich
- 345 for Germany
- 330 for Cairo (Egypt)
- 255 for Bangkok (Thailand)
- 75, 90, 105 and 120 for the Eastern, Central, Rocky Mountain and Pacific time zones (United States)
eq. 31 of reference
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. FAO, Rome, 300(9).
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