Occult occultations, computed
Location

Jupiter's moons in December 2027

Io · Europa · Ganymede · Callisto

Jupiter's four big moons put on a show every night: they slip behind the planet and into its shadow, cross its face, and drag their shadows across the cloud tops. Any telescope shows it. Pick your place: the calendar and the nights keep only what your sky shows.

Where the moons are

Jupiter · December 2027

Jupiter's equator horizontal, east to the left as in binoculars. Drag through the month, or tap any event below to jump there; full screen (⤢) steps through a single night a minute at a time. Moons behind the planet fade, a moon in Jupiter's shadow is an empty ring, and a shadow on the disc is placed from the listed times. Positions ±0.1 Jupiter radii — for the picture; the times come from JPL.

Events

38 events you can see from New Delhi this month, on 21 nights

Mon
Tue
Wed
Thu
Fri
Sat
Sun
11
2
31
4
5263728191
10
11
122131143152162171
18
191
20
211221232243
25
26
27
281
29
303314
behind the planetin its shadowcrossing its faceshadow on the planet

Times in IST, when the moon's centre crosses the edge — as almanacs list them. A night runs from noon to noon. Tap an event to see it in the diagram.

Night of Wed 1 Dec

  1. Io behind Jupiter
    disappears unseen → 02:45 reappears · 2 h 16 min
    Jupiter 20° up · dark sky

Night of Fri 3 Dec

  1. Europa in Jupiter's shadow
    05:33 disappears → reappears unseen · 2 h 44 min
    Jupiter 55° up · dark sky

Night of Sun 5 Dec

  1. Europa's shadow crosses Jupiter
    23:44 enters → 02:26 leaves · 2 h 43 min
    Jupiter below the horizon
  2. Europa crosses Jupiter
    02:08 enters → 04:51 leaves · 2 h 43 min
    Jupiter 15° up · dark sky

Night of Mon 6 Dec

  1. Ganymede in Jupiter's shadow
    23:37 disappears → 02:56 reappears · 3 h 19 min
    Jupiter below the horizon
  2. Callisto behind Jupiter
    03:11 disappears → 05:35 reappears · 2 h 24 min
    Jupiter 29° up · dark sky
  3. Ganymede behind Jupiter
    04:37 disappears → 07:47 reappears · 3 h 10 min
    Jupiter 47° up · dark sky

Night of Tue 7 Dec

  1. Io's shadow crosses Jupiter
    04:06 enters → 06:19 leaves · 2 h 13 min
    Jupiter 41° up · dark sky
  2. Io crosses Jupiter
    05:16 enters → 07:31 leaves · 2 h 15 min
    Jupiter 55° up · dark sky

Night of Wed 8 Dec

  1. Io behind Jupiter
    disappears unseen → 04:39 reappears · 2 h 16 min
    Jupiter 49° up · dark sky

Night of Thu 9 Dec

  1. Io crosses Jupiter
    23:44 enters → 01:59 leaves · 2 h 15 min
    Jupiter below the horizon

Night of Sun 12 Dec

  1. Europa's shadow crosses Jupiter
    02:20 enters → 05:01 leaves · 2 h 41 min
    Jupiter 23° up · dark sky
  2. Europa crosses Jupiter
    04:46 enters → 07:28 leaves · 2 h 42 min
    Jupiter 52° up · dark sky

Night of Mon 13 Dec

  1. Ganymede in Jupiter's shadow
    03:34 disappears → 06:53 reappears · 3 h 18 min
    Jupiter 39° up · dark sky

Night of Tue 14 Dec

  1. Callisto's shadow crosses Jupiter
    01:00 enters → 04:12 leaves · 3 h 12 min
    Jupiter 7° up · dark sky
  2. Europa behind Jupiter
    disappears unseen → 02:33 reappears · 2 h 41 min
    Jupiter 27° up · dark sky
  3. Io's shadow crosses Jupiter
    05:57 enters → 08:12 leaves · 2 h 15 min
    Jupiter 63° up · dark sky

Night of Wed 15 Dec

  1. Io in Jupiter's shadow
    03:03 disappears → reappears unseen · 2 h 16 min
    Jupiter 34° up · dark sky
  2. Io behind Jupiter
    disappears unseen → 06:33 reappears · 2 h 16 min
    Jupiter 64° up · dusk

Night of Thu 16 Dec

  1. Io's shadow crosses Jupiter
    00:27 enters → 02:40 leaves · 2 h 13 min
    Jupiter 1° up · dark sky
  2. Io crosses Jupiter
    01:38 enters → 03:53 leaves · 2 h 15 min
    Jupiter 17° up · dark sky

Night of Fri 17 Dec

  1. Ganymede crosses Jupiter
    22:41 enters → 01:47 leaves · 3 h 06 min
    Jupiter below the horizon

Night of Sun 19 Dec

  1. Europa's shadow crosses Jupiter
    04:53 enters → 07:35 leaves · 2 h 43 min
    Jupiter 57° up · dark sky

Night of Tue 21 Dec

  1. Europa behind Jupiter
    disappears unseen → 05:06 reappears · 2 h 40 min
    Jupiter 60° up · dark sky

Night of Wed 22 Dec

  1. Io in Jupiter's shadow
    04:57 disappears → reappears unseen · 2 h 16 min
    Jupiter 59° up · dark sky

Night of Thu 23 Dec

  1. Io's shadow crosses Jupiter
    02:20 enters → 04:33 leaves · 2 h 13 min
    Jupiter 31° up · dark sky
  2. Io crosses Jupiter
    03:31 enters → 05:46 leaves · 2 h 15 min
    Jupiter 46° up · dark sky

Night of Fri 24 Dec

  1. Ganymede's shadow crosses Jupiter
    21:40 enters → 00:53 leaves · 3 h 13 min
    Jupiter below the horizon
  2. Ganymede crosses Jupiter
    02:37 enters → 05:41 leaves · 3 h 04 min
    Jupiter 36° up · dark sky
  3. Io behind Jupiter
    disappears unseen → 02:55 reappears · 2 h 15 min
    Jupiter 39° up · dark sky

Night of Tue 28 Dec

  1. Europa in Jupiter's shadow
    02:31 disappears → reappears unseen · 2 h 43 min
    Jupiter 37° up · dark sky

Night of Thu 30 Dec

  1. Europa crosses Jupiter
    23:11 enters → 01:52 leaves · 2 h 41 min
    Jupiter below the horizon
  2. Io's shadow crosses Jupiter
    04:13 enters → 06:26 leaves · 2 h 13 min
    Jupiter 57° up · dark sky
  3. Io crosses Jupiter
    05:23 enters → 07:37 leaves · 2 h 14 min
    Jupiter 64° up · dark sky

Night of Fri 31 Dec

  1. Io in Jupiter's shadow
    01:18 disappears → reappears unseen · 2 h 16 min
    Jupiter 25° up · dark sky
  2. Ganymede's shadow crosses Jupiter
    01:26 enters → 01:31 leaves · 4 min
    Jupiter 26° up · dark sky
  3. Ganymede's shadow crosses Jupiter
    01:38 enters → 04:49 leaves · 3 h 12 min
    Jupiter 29° up · dark sky
  4. Io behind Jupiter
    disappears unseen → 04:46 reappears · 2 h 15 min
    Jupiter 62° up · dark sky

Reading the list

Times are for the moment the moon's centre crosses the edge of Jupiter or of its shadow, the convention of published tables; the moon's own disc takes a few minutes to cross. A start or end marked unseen happens behind Jupiter or inside its shadow. “Only what I can see” keeps events with Jupiter more than 10° up in a dark sky. Positions are from JPL DE431 and the jup365 satellite ephemeris, Jupiter as an oblate spheroid with its shadow cone. Mutual-event brightness drops assume uniform discs and are estimates. Events are geocentric — the same instant everywhere on Earth to well under a second.