Occult occultations, computed
Location

Jupiter's moons in December 2028

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 2028

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

26 events you can see from New Delhi this month, on 18 nights

Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2231
4
51
6
7
8
91101112122
13
141
15
161171182193
20
211
22
23
24
252261272281
29
301
31
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 Sat 2 Dec

  1. Io's shadow crosses Jupiter
    05:07 enters → 07:16 leaves · 2 h 09 min
    Jupiter 26° up · dark sky
  2. Io crosses Jupiter
    06:01 enters → 08:13 leaves · 2 h 12 min
    Jupiter 36° up · dark sky

Night of Sun 3 Dec

  1. Io behind Jupiter
    disappears unseen → 05:23 reappears · 2 h 12 min
    Jupiter 30° up · dark sky

Night of Tue 5 Dec

  1. Europa crosses Jupiter
    02:57 enters → 05:30 leaves · 2 h 33 min
    Jupiter 1° up · dark sky

Night of Sat 9 Dec

  1. Ganymede crosses Jupiter
    04:42 enters → 06:59 leaves · 2 h 17 min
    Jupiter 26° up · dark sky

Night of Sun 10 Dec

  1. Io in Jupiter's shadow
    04:07 disappears → reappears unseen · 2 h 11 min
    Jupiter 19° up · dark sky

Night of Mon 11 Dec

  1. Io's shadow crosses Jupiter
    01:29 enters → 03:38 leaves · 2 h 09 min
    Jupiter below the horizon
  2. Io crosses Jupiter
    02:28 enters → 04:40 leaves · 2 h 12 min
    Jupiter below the horizon

Night of Tue 12 Dec

  1. Europa's shadow crosses Jupiter
    03:35 enters → 06:07 leaves · 2 h 33 min
    Jupiter 14° up · dark sky
  2. Europa crosses Jupiter
    05:40 enters → 08:12 leaves · 2 h 32 min
    Jupiter 38° up · dark sky

Night of Thu 14 Dec

  1. Europa behind Jupiter
    disappears unseen → 03:18 reappears · 2 h 34 min
    Jupiter 11° up · dark sky

Night of Sat 16 Dec

  1. Ganymede's shadow crosses Jupiter
    04:30 enters → 06:54 leaves · 2 h 24 min
    Jupiter 27° up · dark sky

Night of Sun 17 Dec

  1. Io in Jupiter's shadow
    06:00 disappears → reappears unseen · 2 h 11 min
    Jupiter 44° up · dark sky

Night of Mon 18 Dec

  1. Io's shadow crosses Jupiter
    03:21 enters → 05:31 leaves · 2 h 10 min
    Jupiter 15° up · dark sky
  2. Io crosses Jupiter
    04:26 enters → 06:37 leaves · 2 h 12 min
    Jupiter 28° up · dark sky

Night of Tue 19 Dec

  1. Io behind Jupiter
    disappears unseen → 03:46 reappears · 2 h 11 min
    Jupiter 21° up · dark sky
  2. Europa's shadow crosses Jupiter
    06:05 enters → 06:07 leaves · 2 min
    Jupiter 45° up · dark sky
  3. Europa's shadow crosses Jupiter
    06:10 enters → 08:41 leaves · 2 h 31 min
    Jupiter 46° up · dark sky

Night of Thu 21 Dec

  1. Europa behind Jupiter
    disappears unseen → 06:00 reappears · 2 h 33 min
    Jupiter 46° up · dark sky

Night of Mon 25 Dec

  1. Io's shadow crosses Jupiter
    05:13 enters → 07:25 leaves · 2 h 11 min
    Jupiter 41° up · dark sky
  2. Io crosses Jupiter
    06:22 enters → 08:33 leaves · 2 h 11 min
    Jupiter 50° up · dusk

Night of Tue 26 Dec

  1. Io behind Jupiter
    disappears unseen → 05:42 reappears · 2 h 11 min
    Jupiter 45° up · dark sky

Night of Wed 27 Dec

  1. Io crosses Jupiter
    00:51 enters → 03:02 leaves · 2 h 11 min
    Jupiter below the horizon
  2. Ganymede behind Jupiter
    03:21 disappears → 05:27 reappears · 2 h 06 min
    Jupiter 21° up · dark sky

Night of Thu 28 Dec

  1. Europa in Jupiter's shadow
    03:45 disappears → reappears unseen · 2 h 33 min
    Jupiter 26° up · dark sky

Night of Sat 30 Dec

  1. Europa crosses Jupiter
    00:20 enters → 02:51 leaves · 2 h 31 min
    Jupiter below the horizon

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.