1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<!--Converted with LaTeX2HTML 97.1 (release) (July 13th, 1997)
by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds
* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
* with significant contributions from:
Jens Lippman, Marek Rouchal, Martin Wilck and others -->
<HTML>
<HEAD>
<TITLE>SLA_EPCO - Convert Epoch to B or J</TITLE>
<META NAME="description" CONTENT="SLA_EPCO - Convert Epoch to B or J">
<META NAME="keywords" CONTENT="sun67">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso_8859_1">
<LINK REL="STYLESHEET" HREF="sun67.css">
<LINK REL="next" HREF="node95.html">
<LINK REL="previous" HREF="node93.html">
<LINK REL="up" HREF="node13.html">
<LINK REL="next" HREF="node95.html">
</HEAD>
<BODY >
<BR> <HR>
<A NAME="tex2html1366" HREF="node95.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A>
<A NAME="tex2html1364" HREF="node13.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A>
<A NAME="tex2html1358" HREF="node93.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="previous_motif.gif"></A> <A HREF="sun67.html#stardoccontents"><IMG ALIGN="BOTTOM" BORDER="0"
SRC="contents_motif.gif"></A>
<BR>
<B> Next:</B> <A NAME="tex2html1367" HREF="node95.html">SLA_EPJ - MJD to Julian Epoch</A>
<BR>
<B>Up:</B> <A NAME="tex2html1365" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A>
<BR>
<B> Previous:</B> <A NAME="tex2html1359" HREF="node93.html">SLA_EPB2D - Besselian Epoch to MJD</A>
<BR> <HR> <P>
<P><!--End of Navigation Panel-->
<H2><A NAME="SECTION000481000000000000000">SLA_EPCO - Convert Epoch to B or J</A>
<A NAME="xref_SLA_EPCO"> </A><A NAME="SLA_EPCO"> </A>
</H2>
<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Convert an epoch to Besselian or Julian to match another one.
<DT><STRONG>CALL:</STRONG>
<DD><TT>D = sla_EPCO (K0, K, E)</TT>
<P> </DL>
<P> <DL>
<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>K0</EM></TD>
<TH ALIGN="LEFT"><B>C</B></TH>
<TD ALIGN="LEFT" NOWRAP>form of result: `B'=Besselian, `J'=Julian</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>K</EM></TD>
<TD ALIGN="LEFT"><B>C</B></TD>
<TD ALIGN="LEFT" NOWRAP>form of given epoch: `B' or `J'</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>E</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>epoch</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>RETURNED:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>sla_EPCO</EM></TD>
<TH ALIGN="LEFT"><B>D</B></TH>
<TD ALIGN="LEFT" NOWRAP>the given epoch converted as necessary</TD>
</TR>
</TABLE></DL>
<P> <DL>
<DT><STRONG>NOTES:</STRONG>
<DD><DL COMPACT>
<DT>1.
<DD>The result is always either equal to or very close to
the given epoch E. The routine is required only in
applications where punctilious treatment of heterogeneous
mixtures of star positions is necessary.
<DT>2.
<DD>K0 and K are not validated. They are interpreted as follows:
<UL>
<LI> If K0 and K are the same, the result is E.
<LI> If K0 is `B' and K isn't, the conversion is J to B.
<LI> In all other cases, the conversion is B to J.
</UL></DL></DL>
<BR> <HR>
<A NAME="tex2html1366" HREF="node95.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next_motif.gif"></A>
<A NAME="tex2html1364" HREF="node13.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up_motif.gif"></A>
<A NAME="tex2html1358" HREF="node93.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="previous_motif.gif"></A> <A HREF="sun67.html#stardoccontents"><IMG ALIGN="BOTTOM" BORDER="0"
SRC="contents_motif.gif"></A>
<BR>
<B> Next:</B> <A NAME="tex2html1367" HREF="node95.html">SLA_EPJ - MJD to Julian Epoch</A>
<BR>
<B>Up:</B> <A NAME="tex2html1365" HREF="node13.html">SUBPROGRAM SPECIFICATIONS</A>
<BR>
<B> Previous:</B> <A NAME="tex2html1359" HREF="node93.html">SLA_EPB2D - Besselian Epoch to MJD</A>
<BR> <HR> <P>
<P><!--End of Navigation Panel-->
<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
</ADDRESS>
</BODY>
</HTML>
|
