airmasscoef | R Documentation |
airmasscoef
is used to calculate, for a given location and time, the direct optical path length of a solar beam through the atmosphere of the Earth, expressed as a ratio relative to the path length vertically upwards.
airmasscoef(
localtime,
lat,
long,
julian,
merid = round(long/15, 0) * 15,
dst = 0
)
localtime |
local time (decimal hour, 24 hour clock). |
lat |
latitude of the location for which the airmass coefficient is required (decimal degrees, -ve south of equator). |
long |
longitude of the location for which the airmass coefficient is required (decimal degrees, -ve west of Greenwich meridian). |
julian |
a numeric value representing the Julian day as returned by |
merid |
an optional numeric value representing the longitude (decimal degrees) of the local time zone meridian (0 for GMT). Default is |
dst |
an optional numeric value representing the time difference from the timezone meridian (hours, e.g. +1 for BST if |
the airmass coefficient, i.e. the direct optical path length of a solar beam through the Earth’s atmosphere, expressed as a ratio relative to the path length vertically upwards for a given location and time.
# airmass coefficient at noon on 21 June 2010, Porthleven, Cornwall
jd <- julday (2010, 6, 21) # Julian day
airmasscoef(12, 50.08, -5.31, jd)
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