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Typos and additions to Arch XV text
The following typos and
dimension additions in Schaefer [2000]
are found [pers. comm. Schaefer [2001]). See also a copy of Schaefer [2000] (with
permission of the editor of Arhaeoastronomy).
- H = site height (altitude) [m]
- l =wavelength [mm]
- S = relative humidity [factor between 0 - 1]
- f = site's latitude [rad]
- as =
RA of sun [°]
- koz=Moz,l *
{1+0.13(f*cos[as]-cos[3f])}
- Z=zenith distance [°]
- HL=height of extinction layer [km]
- XL(HL)=(1-[sin{Z}/{1+(HL/Ro)}]2)-0.5
- B=surface brightness in [erg/cm2/sec/mm/arcsec2]
- a=phase angle of Moon in [°]
- hsun=altitude of Sun above horizon in [°]
- rmoon=angular distance
to Moon [°]
- rsun=angular distance
to Sun [°]
- Bsky in [nL]=Bsky/1.02*10-15
The value is different then Bradley uses in
his BASIC program, see my discussion on this.
- ζ=angular diameter of extended source [']
- SN=Snellen ratio of observer
- θCVA=(40"/SN)*(10^8.28*B-0.29)]
if log(B)<3.17
- θCVA=min[900",(380"/SN)*(10^0.3*B-0.29)] if
log(B)>=3.17
- log(Cth)=-[0.12+0.4*log(B)]+[0.9-0.15*log(B)]*log(100'/ζ) if log(B)<6 and ζ>20'
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