<s>
Astrolog	B-Language
is	O
an	O
open-source	O
astrological	B-Application
software	I-Application
program	I-Application
that	O
has	O
been	O
available	O
online	O
free	O
of	O
charge	O
since	O
1991	O
.	O
</s>
<s>
It	O
has	O
been	O
(	O
as	O
of	O
2023	O
)	O
authored	O
by	O
Walter	O
Pullen	O
since	O
its	O
creation	O
,	O
and	O
was	O
originally	O
distributed	O
via	O
postings	O
to	O
the	O
Usenet	B-Application
newsgroup	O
.	O
</s>
<s>
Astrolog	B-Language
can	O
create	O
horoscopes	O
,	O
natal	O
charts	O
,	O
and	O
calculate	O
current	O
planetary	O
positions	O
in	O
sidereal	O
,	O
traditional	O
,	O
and	O
heliocentric	O
formats	O
.	O
</s>
<s>
Astrolog	B-Language
uses	O
23	O
different	O
house	O
systems	O
,	O
can	O
calculate	O
24	O
different	O
aspects	O
such	O
as	O
trines	O
,	O
squares	O
,	O
semisquares	O
,	O
and	O
rarer	O
ones	O
such	O
as	O
biquintiles	O
,	O
quatronoviles	O
,	O
and	O
sesquiquadrates	O
.	O
</s>
<s>
Astrolog	B-Language
computes	O
the	O
traditional	O
planets	O
,	O
along	O
with	O
asteroids	O
such	O
as	O
Ceres	O
,	O
Juno	O
and	O
Vesta	O
,	O
trans-Neptunian	O
objects	O
such	O
as	O
Eris	O
,	O
Haumea	O
and	O
Makemake	O
,	O
uranian	O
objects	O
such	O
as	O
Vulkanus	O
and	O
Russian	O
Proserpina	O
,	O
and	O
27	O
different	O
planetary	O
moons	O
.	O
</s>
<s>
Astrolog	B-Language
can	O
do	O
forms	O
of	O
locational	O
astrology	O
such	O
as	O
astrocartography	O
.	O
</s>
<s>
Recent	O
versions	O
use	O
the	O
tz	O
database	O
for	O
time	B-Device
zone	I-Device
and	O
daylight	O
saving	O
time	O
detection	O
.	O
</s>
<s>
All	O
versions	O
of	O
Astrolog	B-Language
have	O
been	O
distributed	O
with	O
source	O
code	O
,	O
and	O
the	O
most	O
recent	O
versions	O
are	O
free	B-Application
software	I-Application
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
For	O
example	O
,	O
Astrolog	B-Language
started	O
with	O
the	O
early	O
astrological	O
formulas	O
implemented	O
by	O
Michael	O
Erlewine	O
.	O
</s>
<s>
Other	O
parties	O
contributed	O
PostScript	B-Language
graphics	O
,	O
and	O
integrated	O
ephemeris	O
files	O
for	O
minor	O
planetary	O
objects	O
.	O
</s>
<s>
Astrolog	B-Language
has	O
been	O
ported	O
to	O
many	O
different	O
platforms	O
,	O
where	O
versions	O
exist	O
for	O
Unix	B-Application
,	O
MS-DOS	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
Macintosh	B-Device
,	O
OS/2	B-Application
,	O
and	O
Amiga	B-Device
,	O
among	O
others	O
.	O
</s>
<s>
Astrolog	B-Language
has	O
also	O
been	O
distributed	O
as	O
sample	O
packages	O
with	O
versions	O
of	O
SUSE	O
Linux	O
.	O
</s>
<s>
Some	O
consider	O
Astrolog	B-Language
to	O
rival	O
commercial	O
programs	O
in	O
quality	O
.	O
</s>
<s>
In	O
November	O
1995	O
,	O
The	O
Mountain	O
Astrologer	O
reviewed	O
a	O
number	O
of	O
software	O
programs	O
,	O
where	O
Astrolog	B-Language
was	O
the	O
one	O
freeware	O
program	O
included	O
,	O
described	O
as	O
"	O
good	O
enough	O
to	O
be	O
worthy	O
of	O
review	O
with	O
the	O
main	O
commercial	O
programs	O
"	O
.	O
</s>
<s>
In	O
the	O
1990s	O
,	O
Astrolog	B-Language
was	O
mentioned	O
a	O
number	O
of	O
times	O
in	O
American	O
Astrology	O
's	O
"	O
The	O
New	O
Astrology	O
"	O
article	O
by	O
Ken	O
Irving	O
,	O
because	O
at	O
the	O
time	O
it	O
was	O
the	O
only	O
readily	O
available	O
program	O
that	O
could	O
compute	O
Gauquelin	O
sectors	O
as	O
described	O
by	O
astrologer	O
Michel	O
Gauquelin	O
.	O
</s>
<s>
All	O
versions	O
of	O
Astrolog	B-Language
include	O
a	O
command	O
line	O
interface	O
.	O
</s>
<s>
Windows	O
and	O
Macintosh	B-Device
versions	O
eventually	O
included	O
standard	O
GUI	B-Application
.	O
</s>
<s>
The	O
command	O
switch	O
interface	O
allows	O
all	O
of	O
Astrolog	B-Language
's	O
features	O
to	O
be	O
accessed	O
from	O
shell	O
scripts	O
or	O
to	O
be	O
invoked	O
by	O
other	O
programs	O
.	O
</s>
<s>
There	O
are	O
a	O
number	O
of	O
online	O
servers	B-Application
that	O
use	O
Astrolog	B-Language
as	O
a	O
back	O
end	O
to	O
generate	O
charts	O
for	O
the	O
user	O
.	O
</s>
