galsat

<code>galsat()</code> is used to determine the positions of the four greatest satellites
of Jupiter (called Galilean satellites). Positions are shown on the plot for
given UTC time (Coordinated Universal Time between year 0 and 3000) with respect
to the planet, as seen from the Earth.
The <code>galsat()</code> function returns numerical values of the satellites' positions:
x - the apparent rectangular coordinate of the satellite with respect to the
center of Jupiter's disk in the equatorial plane in the units of Jupiter's
equatorial radius; X is positive toward the west
y - the apparent rectangular coordinate of the satellite with respect to the
center of Jupiter's disk from the equatorial plane in the units of Jupiter's
equatorial radius; Y is positive toward the north
u_corrected - the corrected angular position of the satellite in degrees,
used to determine visibility conditions (whether a moon can be seen against
Jupiter's disk or is hidden behind it)

Calculate, plot and animate the configuration of Jupiter's four
largest satellites (known as Galilean satellites) for a given date and time
(UTC - Coordinated Universal Time).
The galsat() function returns numerical values of the satellites’ positions.
x – the apparent rectangular coordinate of the satellite with respect to the
center of Jupiter’s disk in the equatorial plane in the units of Jupiter’s
equatorial radius; X is positive toward the west,
y – the apparent rectangular coordinate of the satellite with respect to the
center of Jupiter’s disk from the equatorial plane in the units of Jupiter’s
equatorial radius; Y is positive toward the north.
For more details see Meeus (1988, ISBN 0-943396-22-0) "Astronomical Formulae
for Calculators".
The galsat_animate() function creates an animation of the Galilean
satellites' positions. You provide the starting time, duration, the time
step between frames, and the pause between frames.
The function delta_t() returns the value of delta-T in units of seconds.

Lech Jaszowski

galisats

Configuration of Jupiter's Four Largest Satellites

galsat function

<dl><dt>year</dt>
<dd>Type in the year (integer number from 0 to 3000).</dd>
<dt>month</dt>
<dd>Type in the month (integer number from 1 to 12).</dd>
<dt>day</dt>
<dd>Type in the day (integer number from 1 to 31).</dd>
<dt>hour</dt>
<dd>Type in the hour (integer number from 0 to 23).</dd>
<dt>minute</dt>
<dd>Type in the minute (integer number from 0 to 59).</dd></dl>

Arguments

Calculate &amp; draw the positions of the Galilean satellites — galsat

<dl>

<dt>year</dt>
<dd>Type in the year (integer number from 0 to 3000).</dd>


<dt>month</dt>
<dd>Type in the month (integer number from 1 to 12).</dd>


<dt>day</dt>
<dd>Type in the day (integer number from 1 to 31).</dd>


<dt>hour</dt>
<dd>Type in the hour (integer number from 0 to 23).</dd>


<dt>minute</dt>
<dd>Type in the minute (integer number from 0 to 59).</dd>

</dl>

galsat: Calculate & draw the positions of the Galilean satellites

Description

Usage

Value

Arguments

Details

Examples