R: Apparent movement of the Sun from the Earth

A1_calcSol {solaR}

R Documentation

Apparent movement of the Sun from the Earth

Description

Compute the apparent movement of the Sun from the Earth with the functions fSolD and fSolI.

Usage

calcSol(lat, BTd, sample = 'hour', BTi,
        EoT = TRUE, keep.night = TRUE,
        method = 'michalsky')

Arguments

`lat`	Latitude (degrees) of the point of the Earth where calculations are needed. It is positive for locations above the Equator.
`BTd`	Daily time base, a `POSIXct` object which may be the result of `fBTd`. It is not considered if `BTi` is provided.
`sample`	Increment of the intradaily sequence. It is a character string, containing one of ‘"sec"’, ‘"min"’, ‘"hour"’. This can optionally be preceded by a (positive or negative) integer and a space, or followed by ‘"s"’. It is used by `seq.POSIXt`. It is not considered if `BTi` is provided.
`BTi`	Intradaily time base, a `POSIXct` object to be used by `fSolI`. It could be the index of the `G0I` argument to `calcG0`.
`EoT`	logical, if `TRUE` the Equation of Time is used. Default is TRUE.
`keep.night`	logical, if `TRUE` (default) the night is included in the time series.
`method`	`character`, method for the sun geometry calculations to be chosen from 'cooper', 'spencer', 'michalsky' and 'strous'. See references for details.

Value

A Sol-class object.

Author(s)

Oscar Perpiñán Lamigueiro.

References

Cooper, P.I., Solar Energy, 12, 3 (1969). "The Absorption of Solar Radiation in Solar Stills"
Spencer, Search 2 (5), 172, https://www.mail-archive.com/sundial@uni-koeln.de/msg01050.html
Strous: https://www.aa.quae.nl/en/reken/zonpositie.html
Michalsky, J., 1988: The Astronomical Almanac's algorithm for approximate solar position (1950-2050), Solar Energy 40, 227-235
Perpiñán, O, Energía Solar Fotovoltaica, 2015. (https://oscarperpinan.github.io/esf/)
Perpiñán, O. (2012), "solaR: Solar Radiation and Photovoltaic Systems with R", Journal of Statistical Software, 50(9), 1-32, doi: 10.18637/jss.v050.i09

Examples

BTd = fBTd(mode = 'serie')

lat = 37.2
sol = calcSol(lat, BTd[100])
print(as.zooD(sol))

library(lattice)
xyplot(as.zooI(sol))

solStrous = calcSol(lat, BTd[100], method = 'strous')
print(as.zooD(solStrous))

solSpencer = calcSol(lat, BTd[100], method = 'spencer')
print(as.zooD(solSpencer))

solCooper = calcSol(lat, BTd[100], method = 'cooper')
print(as.zooD(solCooper))

[Package solaR version 0.46 Index]