Labels:book | crt screen | earth | fence | monitor | person | poster | reckoner | sky | trade name OCR: In equa tion is a nighttime relaxation time which is taken to be a constant independ ient of season and geographical location. TSUNSET is the elapsed time in hours since sunset. During the day,a different relaxation time TD IS assumed. In contrast to TN TD markedly dependent on location and posit ition, albeit in an analy tically simple fashion. Specifically, we assume the daytime relaxation time to be function of the actual noon- time solar zenith angle (cos XNOON): TD = To cos (NOONx P2 where summer TO at and P2 are again constants independent of season 10 location. winter Note TD that during equatorial and moderate latitudes, TD whereas in the The time dependence of cos Xeff during the 1S approximated as follows. First, we simplify the time dependence of the actual cos x in terms of its ...
