<s>
Skyglobe	B-Application
is	O
an	O
astronomy	O
program	O
for	O
MS-DOS	B-Application
and	O
Microsoft	B-Application
Windows	I-Application
first	O
developed	O
in	O
the	O
late	O
1980s	O
and	O
early	O
1990s	O
,	O
and	O
originally	O
sold	O
as	O
Shareware	B-License
but	O
now	O
available	O
as	O
closed-source	O
freeware	B-License
.	O
</s>
<s>
Skyglobe	B-Application
was	O
designed	O
by	O
Mark	O
A	O
.	O
Haney	O
and	O
his	O
company	O
KlassM	O
Software	O
Inc	O
.	O
in	O
Ann	O
Arbor	O
,	O
Michigan	O
,	O
and	O
first	O
released	O
in	O
1989	O
,	O
after	O
Mark	O
graduated	O
in	O
computer	B-General_Concept
science	I-General_Concept
from	O
Michigan	O
State	O
University	O
.	O
</s>
<s>
Use	O
of	O
Skyglobe	B-Application
is	O
still	O
suggested	O
to	O
students	O
at	O
Villanova	O
University	O
.	O
</s>
<s>
Registered	O
users	O
of	O
the	O
MS-DOS	B-Application
version	O
received	O
additional	O
software	O
,	O
such	O
as	O
a	O
Skyglobe	B-Application
screensaver	O
,	O
and	O
Crystal	O
Sphere	O
,	O
an	O
application	O
simulating	O
the	O
3,800	O
stars	O
nearest	O
the	O
solar	O
system	O
.	O
</s>
<s>
At	O
least	O
two	O
versions	O
of	O
Skyglobe	B-Application
were	O
later	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
being	O
variously	O
listed	O
as	O
versions	O
1.0	O
,	O
2.0	O
,	O
2.02	O
and	O
4.0	O
,	O
as	O
well	O
as	O
other	O
possible	O
iterations	O
between	O
.	O
</s>
<s>
Skyglobe	B-Application
for	O
Windows	O
(	O
also	O
known	O
as	O
SG4WIN	O
)	O
is	O
freely	O
available	O
online	O
.	O
</s>
<s>
Skyglobe	B-Application
accounts	O
for	O
the	O
earth	O
's	O
precession	O
in	O
its	O
calculations	O
and	O
should	O
therefore	O
be	O
accurate	O
to	O
tens	O
of	O
thousands	O
of	O
years	O
in	O
the	O
past	O
and	O
the	O
future	O
,	O
but	O
its	O
manual	O
does	O
warn	O
that	O
the	O
positions	O
of	O
planets	O
might	O
not	O
be	O
accurate	O
throughout	O
this	O
range	O
(	O
it	O
says	O
"	O
their	O
coordinates	O
are	O
approximately	O
correct	O
for	O
as	O
far	O
back	O
and	O
forward	O
as	O
we	O
have	O
data	O
"	O
)	O
.	O
</s>
<s>
Skyglobe	B-Application
's	O
dates	O
use	O
the	O
Julian	O
calendar	O
until	O
October	O
4	O
,	O
1582	O
,	O
and	O
the	O
Gregorian	O
calendar	O
thereafter	O
.	O
</s>
<s>
Commands	O
in	O
the	O
DOS	O
version	O
of	O
Skyglobe	B-Application
are	O
mostly	O
keystroke-based	O
,	O
and	O
by	O
default	O
the	O
available	O
keys	O
are	O
listed	O
on	O
the	O
screen	O
for	O
reference	O
.	O
</s>
<s>
If	O
the	O
object	O
being	O
searched	O
for	O
is	O
not	O
currently	O
above	O
the	O
horizon	O
but	O
will	O
be	O
in	O
the	O
next	O
24	O
hours	O
,	O
Skyglobe	B-Application
will	O
adjust	O
the	O
time	O
appropriately	O
.	O
</s>
<s>
A	O
mouse	B-Device
can	O
be	O
used	O
to	O
change	O
the	O
viewing	O
direction	O
or	O
to	O
point	O
at	O
objects	O
;	O
the	O
object	O
under	O
the	O
mouse	B-Device
will	O
be	O
named	O
in	O
the	O
lower-left	O
corner	O
of	O
the	O
screen	O
,	O
along	O
with	O
its	O
horizontal	O
and	O
equatorial	O
coordinates	O
.	O
</s>
<s>
Clicking	O
with	O
the	O
mouse	B-Device
will	O
re-center	O
the	O
display	O
at	O
that	O
point	O
,	O
and	O
right-clicking	O
will	O
"	O
lock	O
"	O
that	O
position	O
or	O
object	O
to	O
the	O
display	O
's	O
center	O
so	O
you	O
can	O
more	O
easily	O
follow	O
it	O
over	O
time	O
changes	O
.	O
</s>
<s>
Skyglobe	B-Application
can	O
be	O
made	O
to	O
animate	O
the	O
changes	O
of	O
any	O
of	O
its	O
parameters	O
with	O
its	O
"	O
turbo	O
"	O
function	O
,	O
most	O
commonly	O
used	O
to	O
speed	O
up	O
time	O
.	O
</s>
