Occult occultations, computed
Location

Jupiter's moons in January 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 · January 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

52 events you can see from New Delhi this month, on 22 nights

Mon
Tue
Wed
Thu
Fri
Sat
Sun
12
2
3
41
5
63738391
10
111
12
133141153162173182
19
202
21
224232242253
26
27
28
294302314
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 Fri 31 Dec

  1. Ganymede crosses Jupiter
    06:29 enters → 09:31 leaves · 3 h 02 min
    Jupiter 60° up · dusk

Night of Sat 1 Jan

  1. Io's shadow crosses Jupiter
    22:41 enters → 00:54 leaves · 2 h 13 min
    Jupiter below the horizon
  2. Io crosses Jupiter
    23:50 enters → 02:05 leaves · 2 h 14 min
    Jupiter 6° up · dark sky

Night of Tue 4 Jan

  1. Europa in Jupiter's shadow
    05:05 disappears → reappears unseen · 2 h 42 min
    Jupiter 64° up · dark sky

Night of Thu 6 Jan

  1. Europa's shadow crosses Jupiter
    23:22 enters → 02:03 leaves · 2 h 41 min
    Jupiter 4° up · dark sky
  2. Europa crosses Jupiter
    01:42 enters → 04:22 leaves · 2 h 40 min
    Jupiter 34° up · dark sky
  3. Io's shadow crosses Jupiter
    06:06 enters → 08:19 leaves · 2 h 13 min
    Jupiter 60° up · dark sky

Night of Fri 7 Jan

  1. Io in Jupiter's shadow
    03:12 disappears → reappears unseen · 2 h 16 min
    Jupiter 53° up · dark sky
  2. Ganymede's shadow crosses Jupiter
    05:31 enters → 08:46 leaves · 3 h 14 min
    Jupiter 63° up · dark sky
  3. Io behind Jupiter
    disappears unseen → 06:37 reappears · 2 h 15 min
    Jupiter 56° up · dusk

Night of Sat 8 Jan

  1. Io's shadow crosses Jupiter
    00:34 enters → 02:47 leaves · 2 h 13 min
    Jupiter 22° up · dark sky
  2. Io crosses Jupiter
    01:41 enters → 03:55 leaves · 2 h 14 min
    Jupiter 36° up · dark sky
  3. Callisto in Jupiter's shadow
    03:09 disappears → 06:07 reappears · 2 h 58 min
    Jupiter 53° up · dark sky

Night of Sun 9 Jan

  1. Io behind Jupiter
    disappears unseen → 01:05 reappears · 2 h 15 min
    Jupiter 29° up · dark sky

Night of Tue 11 Jan

  1. Ganymede behind Jupiter
    00:09 disappears → 03:09 reappears · 3 h 00 min
    Jupiter 19° up · dark sky

Night of Thu 13 Jan

  1. Europa's shadow crosses Jupiter
    01:50 enters → 01:52 leaves · 2 min
    Jupiter 42° up · dark sky
  2. Europa's shadow crosses Jupiter
    01:57 enters → 04:37 leaves · 2 h 41 min
    Jupiter 43° up · dark sky
  3. Europa crosses Jupiter
    04:10 enters → 06:50 leaves · 2 h 40 min
    Jupiter 63° up · dark sky

Night of Fri 14 Jan

  1. Io in Jupiter's shadow
    05:05 disappears → reappears unseen · 2 h 16 min
    Jupiter 63° up · dark sky

Night of Sat 15 Jan

  1. Europa behind Jupiter
    disappears unseen → 01:44 reappears · 2 h 38 min
    Jupiter 42° up · dark sky
  2. Io's shadow crosses Jupiter
    02:26 enters → 04:40 leaves · 2 h 14 min
    Jupiter 50° up · dark sky
  3. Io crosses Jupiter
    03:30 enters → 05:44 leaves · 2 h 14 min
    Jupiter 60° up · dark sky

Night of Sun 16 Jan

  1. Io in Jupiter's shadow
    23:34 disappears → reappears unseen · 2 h 16 min
    Jupiter 15° up · dark sky
  2. Io behind Jupiter
    disappears unseen → 02:54 reappears · 2 h 15 min
    Jupiter 55° up · dark sky

Night of Mon 17 Jan

  1. Io's shadow crosses Jupiter
    20:55 enters → 23:08 leaves · 2 h 13 min
    Jupiter below the horizon
  2. Io crosses Jupiter
    21:57 enters → 00:11 leaves · 2 h 14 min
    Jupiter below the horizon
  3. Callisto crosses Jupiter
    23:32 enters → 01:04 leaves · 1 h 32 min
    Jupiter 16° up · dark sky

Night of Tue 18 Jan

  1. Ganymede in Jupiter's shadow
    23:24 disappears → 02:39 reappears · 3 h 14 min
    Jupiter 15° up · dark sky
  2. Ganymede behind Jupiter
    03:50 disappears → 06:48 reappears · 2 h 59 min
    Jupiter 63° up · dark sky

Night of Thu 20 Jan

  1. Europa's shadow crosses Jupiter
    04:31 enters → 07:13 leaves · 2 h 42 min
    Jupiter 63° up · dark sky
  2. Europa crosses Jupiter
    06:36 enters → 09:16 leaves · 2 h 40 min
    Jupiter 47° up · dusk

Night of Sat 22 Jan

  1. Europa in Jupiter's shadow
    23:28 disappears → reappears unseen · 2 h 42 min
    Jupiter 19° up · dark sky
  2. Europa behind Jupiter
    disappears unseen → 04:07 reappears · 2 h 38 min
    Jupiter 64° up · dark sky
  3. Io's shadow crosses Jupiter
    04:20 enters → 06:33 leaves · 2 h 13 min
    Jupiter 64° up · dark sky
  4. Io crosses Jupiter
    05:18 enters → 07:32 leaves · 2 h 14 min
    Jupiter 59° up · dark sky

Night of Sun 23 Jan

  1. Io in Jupiter's shadow
    01:27 disappears → reappears unseen · 2 h 16 min
    Jupiter 45° up · dark sky
  2. Io behind Jupiter
    disappears unseen → 04:42 reappears · 2 h 15 min
    Jupiter 62° up · dark sky

Night of Mon 24 Jan

  1. Io's shadow crosses Jupiter
    22:47 enters → 01:01 leaves · 2 h 14 min
    Jupiter 12° up · dark sky
  2. Io crosses Jupiter
    23:45 enters → 01:59 leaves · 2 h 14 min
    Jupiter 25° up · dark sky

Night of Tue 25 Jan

  1. Callisto in Jupiter's shadow
    21:11 disappears → 23:58 reappears · 2 h 47 min
    Jupiter below the horizon
  2. Io behind Jupiter
    disappears unseen → 23:09 reappears · 2 h 15 min
    Jupiter 18° up · dark sky
  3. Ganymede in Jupiter's shadow
    03:22 disappears → 06:36 reappears · 3 h 14 min
    Jupiter 63° up · dark sky

Night of Sat 29 Jan

  1. Ganymede crosses Jupiter
    21:10 enters → 00:06 leaves · 2 h 56 min
    Jupiter below the horizon
  2. Europa in Jupiter's shadow
    02:01 disappears → reappears unseen · 2 h 41 min
    Jupiter 56° up · dark sky
  3. Io's shadow crosses Jupiter
    06:11 enters → 08:26 leaves · 2 h 14 min
    Jupiter 45° up · dark sky
  4. Europa behind Jupiter
    disappears unseen → 06:28 reappears · 2 h 38 min
    Jupiter 41° up · dusk

Night of Sun 30 Jan

  1. Io in Jupiter's shadow
    03:21 disappears → reappears unseen · 2 h 16 min
    Jupiter 64° up · dark sky
  2. Io behind Jupiter
    disappears unseen → 06:30 reappears · 2 h 15 min
    Jupiter 40° up · dusk

Night of Mon 31 Jan

  1. Europa's shadow crosses Jupiter
    20:23 enters → 23:05 leaves · 2 h 42 min
    Jupiter below the horizon
  2. Europa crosses Jupiter
    22:11 enters → 00:50 leaves · 2 h 39 min
    Jupiter 11° up · dark sky
  3. Io's shadow crosses Jupiter
    00:40 enters → 02:54 leaves · 2 h 14 min
    Jupiter 42° up · dark sky
  4. Io crosses Jupiter
    01:32 enters → 03:45 leaves · 2 h 14 min
    Jupiter 52° 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.