Online computing software by Jenik Hollan

(see more info at the bottom)

Name	Last modified	Size	Description

Parent Directory		-
obj.dbf	2002-06-04 22:27	87K	deep-sky objects list
SunDial.hlp	2005-02-17 20:20	5.3K
images/	2006-01-11 19:45	-
other/	2006-03-10 22:12	-
hordial.pdf	2010-03-15 18:17	229K	horizontal sundial
pascal_sources/	2010-10-26 22:53	-
objb.dbf	2010-11-01 10:15	87K
Map_BSC.hlp	2010-12-02 12:43	14K
results/	2014-01-22 13:00	-
tob.txt	2014-07-21 12:16	6.2K
ob.txt	2014-07-21 12:22	6.2K
obs.eps	2014-07-21 12:37	30K
ob.eps	2014-07-22 12:21	18K
insolation.php	2015-11-21 20:03	3.7K	daily solar gains
padi.php	2015-11-21 20:05	4.7K	mutual star positions
star_pos.php	2015-11-21 20:05	3.8K	Star positions and AM
tr_bin_t.php	2015-11-21 20:05	2.1K	orbit of a binary
map.php	2015-11-22 00:12	5.5K	makes a stellar chart
ies_eld_view/	2015-11-22 19:02	-
nights.php	2015-11-23 12:20	4.8K	symlink to *.phtml
nights.phtml	2015-11-23 12:20	4.8K	beg./end of the night
lum.phtml	2016-04-27 12:19	5.0K	luminance units conv.
lun_illum.cz.php	2016-05-04 11:16	5.2K	symlink to *.phtml
lun_illum.cz.phtml	2016-05-04 11:16	5.2K	Osvetlenost mesicem
lun_illum.php	2016-05-04 11:44	6.0K	Planetary ephemeris
maps/	2016-12-06 22:54	-	old and new star maps
map.pdf	2020-11-13 02:00	38K
BSJZMDQFBPDXMV	2021-06-29 10:45	1.2K
TVSWWYQQDC	2021-10-10 20:15	1.2K
BWKGMAFKOQJIIKL	2021-10-26 10:55	1.2K
BMVGOUVIEWX	2022-01-11 22:40	1.2K
sundials/	2023-05-16 09:19	-
screen.eps	2024-10-12 14:35	141K
map.eps	2024-12-22 01:14	25K	the last map, PS form
map.png	2024-12-22 01:14	15K

Computation of lighting-relevant values

Some programmes useful for lighting evaluation purposes

will eventually be placed in this directory. At present, there are just

lun_illum.php for computation of direct moonlight anywhere anytime (the source script is this one; thanks to Rudolf Novak for giving me the advice),
nights.php for computation of the length of the night (the source script is this one),
lum.php for conversion of SI luminance units to some queer astronomical ones (the source script is this one),
insolation.php for computation of sundials or of clear-sky solar gains through windows etc. (the source script is this one),
star_pos.php for displaying the Bright Star Catalogue star data and computing azimuths, heights and airmasses (the source script is this one),
padi.php for displaying the Position Angle and Angular Distance of pairs of stars (the source script is this one),
tr_bin_t.php the same for binaries (a Czech-English hybrid),
and a powerful stellar chart programme map.php (the source script is this one).

An example of its output is mach.png, a map for the January 2005 comet Machholz, made by the map.php by writing
@mach.cnf np o wpmach.eps d5.1.2005 t20 ut0
on the command line and checking the box ``override'' (in fact, I've deleted most of the deep-sky objects from mach.eps and remade the png and pdf files). The times are UTC (comet positions as passing near Pleiades, each ``European'' evening).

(February and March comet positions produced similarly with a command line
@mach.cnf np o wpmap.eps ra15 de80 d8.2.2005 t20 ut0 $s2 $n30 m800
and less editing are the files mach2.*, e.g. mach2.png.)

jenik hollan, Jan 06, 2005

(my info on ‘light at night’ is at http://www.astro.cz/darksky)