Editing Orrery

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its four main moons, which are color coded for easy identification, in their proper positions for the current time (or any other time you set).  All four moons will not always be visible - sometimes they pass behind Jupiter and are
its four main moons, which are color coded for easy identification, in their proper positions for the current time (or any other time you set).  All four moons will not always be visible - sometimes they pass behind Jupiter and are
blocked from our line of sight.  Occasionally the shadow of one of the moons will pass across Jupiter's disk, and that shadow too will be shown in the plot.
blocked from our line of sight.  Occasionally the shadow of one of the moons will pass across Jupiter's disk, and that shadow too will be shown in the plot.
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Because the inclination of Jupiter's axis is only 3 degrees, and the moons orbit nearly in Jupiter's equatorial plane, these moons appear to move nearly on a line, with Jupiter in the center.  Eclipses for the three innermost moons happen very frequently, and Callisto, the outermost Galilean Moon, is eclipsed less frequently.  Which side the moons appear on depends upon what equipment you use to observe them.  Many telescopes invert or mirror reflect the image.
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Because the inclination of Jupiter's axis is only 3 degrees, and the moons orbit nearly in Jupiter's equatorial plane, these moons appear to move nearly on a line, with Jupiter in the center.  Eclipses for the three innermost moons happen very frequently, and Callisto, the outermost Galilean Moon, is eclipsed less frequently.  Which side the moons appear on depends upon what equipment you use to observe them.  Many telescopes invert of mirror reflect the image.
There are four buttons near the bottom of the page which allow you to
There are four buttons near the bottom of the page which allow you to
invert and reflect the plots, to make them match what you see with your equipment.
invert and reflect the plots, to make them match what you see with your equipment.
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The Events page lists the times of the satellite events such as eclipses, occultations and transits.  This page takes a second or so to plot,
The Events page lists the times of the satellite events such as eclipses, occultations and transits.  This page takes a second or so to plot,
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because it requires roughly one million double precision trigonometric functions to be evaluated (the event timings are calculated by your phone, not fetched from a website). Since the app is location-aware, it can tell you which of these events will be visible to you from your current location.    If the Sun is above the horizon, or Jupiter is below the horizon, you cannot see a satellite event; such events are listed in grey.  Events that you can see are shown in green, except for he ''next'' event you can see, which is shown in red.  The times are all in UT, of course.  The plot on the right shows the events for the very special evening of Oct 12, 2013.  On that night three satellite shadows crossing Jupiter's disk are visible at once (see plot at the top of the page).  The color coding shows that this rare triple shadow event will be visible from my current location.
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because it requires roughly one million double precision trigonometric functions to be evaluated (the event timings are calculated by your phone, not fetched from a website). Since the app is location-aware, it can tell you which of these events will be visible to you from your current location.    If the sun is above the horizon, or Jupiter is below the horizon, you cannot see these events, so they are listed in grey.  Events that you can see are shown in green, except for he ''next'' event you can see, which is shown in red.  The times are all in UT, of course.  The plot on the right shows the events for the very special evening of Oct 12, 2013.  On that night three satellite shadows are visible at once (see plot at the top of the page).  The color coding shows that this rare triple shadow event will be visible from my current location.
At the bottom of the Events page is a button you can click to return to the Graph page.
At the bottom of the Events page is a button you can click to return to the Graph page.

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