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...
longshot wrote:


Td = Ta/(1-Taln(R)/9621), approximately, with temperatures in absolute
Rankine degrees and RH R in fractional form. For instance, 70 F (Ta
= 70+460 = 530 R) air at 50% RH (R = 0.5) has Td = 530/(1-530ln(0.5)/9621)
= 510.5 R, ie Td = 510.5-460 = 50.5 F.

Nick


Thanks, that cleared it right up!
Greg