solalt: Calculates the solar altitude

In dklinges9/mcera5: Tools to Acquire and Process ERA5 Data for Use in Microclimate Modelling

Calculates the solar altitude

Description

'solalt' is used to calculate the solar altitude at any given location from the local time.

Usage

solalt(localtime, lat, long, julian, merid = round(long/15, 0) * 15, dst = 0)

Arguments

localtime	local time (decimal hour, 24 hour clock).
lat	latitude of the location for which the solar altitude is required (decimal degrees, -ve south of the equator).
long	longitude of the location for which the solar altitude is required (decimal degrees, -ve west of Greenwich meridian).
julian	Julian day expressed as an integer as returned by [julday()].
merid	an optional numeric value representing the longitude (decimal degrees) of the local time zone meridian (0 for GMT). Default is 'round(long / 15, 0) * 15'
dst	an optional numeric value representing the time difference from the timezone meridian (hours, e.g. +1 for BST if 'merid' = 0).

Value

a numeric value representing the solar altitude (º).

Examples

# solar altitude at noon on 21 June 2010, Porthleven, Cornwall
jd <- julday (2010, 6, 21) # Julian day
solalt(12, 50.08, -5.31, jd)

dklinges9/mcera5 documentation built on March 1, 2024, 11:40 p.m.