Occult occultations, computed
Location

Jupiter's moons in January 2027

Io · Europa · Ganymede · Callisto — 13 mutual events

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. This is a mutual-event season — the moons' orbits are edge-on to the Sun and they eclipse and occult each other. Pick your place: the calendar and the nights keep only what your sky shows.

Where the moons are

Jupiter · January 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

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

Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
213543556173
8
9
103113124132143
15
16
17
181194202216
22
231
24
252264272285291305
31
behind the planetin its shadowcrossing its faceshadow on the planetmoons eclipse or hide each other

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 Jan

  1. Io in Jupiter's shadow
    05:48 disappears → reappears unseen · 2 h 18 min
    Jupiter 54° up · dark sky

Night of Sun 3 Jan

  1. Io's shadow crosses Jupiter
    03:05 enters → 05:19 leaves · 2 h 14 min
    Jupiter 75° up · dark sky
  2. Europa in Jupiter's shadow
    03:27 disappears → reappears unseen · 2 h 50 min
    Jupiter 75° up · dark sky
  3. Io crosses Jupiter
    03:52 enters → 06:09 leaves · 2 h 17 min
    Jupiter 74° up · dark sky
  4. Ganymede in Jupiter's shadow
    04:33 disappears → reappears unseen · 3 h 38 min
    Jupiter 68° up · dark sky
  5. Io eclipses Ganymede
    05:02 · 5.3 min
    40% of Ganymede covered · ≈0.6 mag fainter · Jupiter 62° up · dark sky

Night of Mon 4 Jan

  1. Io in Jupiter's shadow
    00:16 disappears → reappears unseen · 2 h 18 min
    Jupiter 45° up · dark sky
  2. Europa eclipses Ganymede
    00:54 · 18.3 min
    33% of Ganymede covered · ≈0.4 mag fainter · Jupiter 54° up · dark sky
  3. Io behind Jupiter
    disappears unseen → 03:25 reappears · 2 h 19 min
    Jupiter 75° up · dark sky

Night of Tue 5 Jan

  1. Io's shadow crosses Jupiter
    21:32 enters → 23:47 leaves · 2 h 16 min
    Jupiter 10° up · dark sky
  2. Europa's shadow crosses Jupiter
    22:10 enters → 01:03 leaves · 2 h 53 min
    Jupiter 19° up · dark sky
  3. Callisto behind Jupiter
    22:10 disappears → 02:50 reappears · 4 h 40 min
    Jupiter 19° up · dark sky
  4. Io crosses Jupiter
    22:19 enters → 00:36 leaves · 2 h 17 min
    Jupiter 21° up · dark sky
  5. Europa crosses Jupiter
    23:49 enters → 02:41 leaves · 2 h 53 min
    Jupiter 40° up · dark sky

Night of Wed 6 Jan

  1. Io behind Jupiter
    disappears unseen → 21:51 reappears · 2 h 19 min
    Jupiter 16° up · dark sky

Night of Thu 7 Jan

  1. Ganymede's shadow crosses Jupiter
    18:39 enters → 22:15 leaves · 3 h 36 min
    Jupiter below the horizon
  2. Ganymede crosses Jupiter
    21:46 enters → 01:23 leaves · 3 h 37 min
    Jupiter 15° up · dark sky
  3. Ganymede eclipses Io
    06:30 · 8.5 min
    87% of Io covered · ≈2.2 mag fainter · Jupiter 40° up · dusk

Night of Sun 10 Jan

  1. Io's shadow crosses Jupiter
    04:55 enters → 07:12 leaves · 2 h 17 min
    Jupiter 58° up · dark sky
  2. Io crosses Jupiter
    05:37 enters → 07:55 leaves · 2 h 17 min
    Jupiter 49° up · dark sky
  3. Europa in Jupiter's shadow
    06:00 disappears → reappears unseen · 2 h 50 min
    Jupiter 44° up · dark sky

Night of Mon 11 Jan

  1. Io in Jupiter's shadow
    02:10 disappears → reappears unseen · 2 h 18 min
    Jupiter 73° up · dark sky
  2. Europa eclipses Ganymede
    05:00 · 12.6 min
    16% of Ganymede covered · ≈0.2 mag fainter · Jupiter 56° up · dark sky
  3. Io behind Jupiter
    disappears unseen → 05:11 reappears · 2 h 19 min
    Jupiter 54° up · dark sky

Night of Tue 12 Jan

  1. Io's shadow crosses Jupiter
    23:24 enters → 01:41 leaves · 2 h 17 min
    Jupiter 42° up · dark sky
  2. Io crosses Jupiter
    00:04 enters → 02:21 leaves · 2 h 17 min
    Jupiter 50° up · dark sky
  3. Europa's shadow crosses Jupiter
    00:46 enters → 03:39 leaves · 2 h 53 min
    Jupiter 59° up · dark sky
  4. Europa crosses Jupiter
    02:08 enters → 05:01 leaves · 2 h 53 min
    Jupiter 73° up · dark sky

Night of Wed 13 Jan

  1. Io behind Jupiter
    disappears unseen → 23:37 reappears · 2 h 19 min
    Jupiter 45° up · dark sky
  2. Callisto's shadow crosses Jupiter
    00:46 enters → 05:32 leaves · 4 h 46 min
    Jupiter 60° up · dark sky

Night of Thu 14 Jan

  1. Ganymede's shadow crosses Jupiter
    22:37 enters → 02:13 leaves · 3 h 36 min
    Jupiter 33° up · dark sky
  2. Europa behind Jupiter
    disappears unseen → 23:23 reappears · 2 h 50 min
    Jupiter 43° up · dark sky
  3. Ganymede crosses Jupiter
    01:09 enters → 04:46 leaves · 3 h 36 min
    Jupiter 66° up · dark sky

Night of Mon 18 Jan

  1. Io in Jupiter's shadow
    04:04 disappears → reappears unseen · 2 h 18 min
    Jupiter 61° up · dark sky

Night of Tue 19 Jan

  1. Io's shadow crosses Jupiter
    01:18 enters → 03:34 leaves · 2 h 16 min
    Jupiter 71° up · dark sky
  2. Io crosses Jupiter
    01:48 enters → 04:05 leaves · 2 h 17 min
    Jupiter 75° up · dark sky
  3. Europa's shadow crosses Jupiter
    03:22 enters → 06:15 leaves · 2 h 53 min
    Jupiter 69° up · dark sky
  4. Europa crosses Jupiter
    04:26 enters → 07:18 leaves · 2 h 52 min
    Jupiter 56° up · dark sky

Night of Wed 20 Jan

  1. Io in Jupiter's shadow
    22:33 disappears → reappears unseen · 2 h 18 min
    Jupiter 38° up · dark sky
  2. Io behind Jupiter
    disappears unseen → 01:22 reappears · 2 h 18 min
    Jupiter 72° up · dark sky

Night of Thu 21 Jan

  1. Io's shadow crosses Jupiter
    19:46 enters → 22:03 leaves · 2 h 16 min
    Jupiter 3° up · dark sky
  2. Io crosses Jupiter
    20:14 enters → 22:31 leaves · 2 h 17 min
    Jupiter 9° up · dark sky
  3. Europa in Jupiter's shadow
    21:51 disappears → reappears unseen · 2 h 50 min
    Jupiter 30° up · dark sky
  4. Europa behind Jupiter
    disappears unseen → 01:39 reappears · 2 h 50 min
    Jupiter 75° up · dark sky
  5. Ganymede's shadow crosses Jupiter
    02:34 enters → 06:11 leaves · 3 h 37 min
    Jupiter 74° up · dark sky
  6. Ganymede crosses Jupiter
    04:29 enters → 08:06 leaves · 3 h 36 min
    Jupiter 53° up · dark sky

Night of Sat 23 Jan

  1. Europa crosses Jupiter
    17:34 enters → 20:26 leaves · 2 h 52 min
    Jupiter below the horizon

Night of Mon 25 Jan

  1. Ganymede behind Jupiter
    disappears unseen → 21:44 reappears · 3 h 38 min
    Jupiter 32° up · dark sky
  2. Io in Jupiter's shadow
    05:58 disappears → reappears unseen · 2 h 18 min
    Jupiter 30° up · dark sky

Night of Tue 26 Jan

  1. Io's shadow crosses Jupiter
    03:10 enters → 05:28 leaves · 2 h 17 min
    Jupiter 65° up · dark sky
  2. Io crosses Jupiter
    03:32 enters → 05:49 leaves · 2 h 17 min
    Jupiter 61° up · dark sky
  3. Europa's shadow crosses Jupiter
    05:58 enters → 08:51 leaves · 2 h 53 min
    Jupiter 29° up · dark sky
  4. Europa crosses Jupiter
    06:42 enters → 09:35 leaves · 2 h 52 min
    Jupiter 20° up · dusk

Night of Wed 27 Jan

  1. Io in Jupiter's shadow
    00:27 disappears → reappears unseen · 2 h 18 min
    Jupiter 68° up · dark sky
  2. Io behind Jupiter
    disappears unseen → 03:06 reappears · 2 h 18 min
    Jupiter 65° up · dark sky

Night of Thu 28 Jan

  1. Io's shadow crosses Jupiter
    21:39 enters → 23:56 leaves · 2 h 18 min
    Jupiter 34° up · dark sky
  2. Io crosses Jupiter
    21:58 enters → 00:15 leaves · 2 h 17 min
    Jupiter 38° up · dark sky
  3. Europa in Jupiter's shadow
    00:24 disappears → reappears unseen · 2 h 50 min
    Jupiter 69° up · dark sky
  4. Europa behind Jupiter
    disappears unseen → 03:53 reappears · 2 h 50 min
    Jupiter 55° up · dark sky
  5. Ganymede's shadow crosses Jupiter
    06:30 enters → 10:09 leaves · 3 h 39 min
    Jupiter 21° up · dusk

Night of Fri 29 Jan

  1. Io behind Jupiter
    disappears unseen → 21:32 reappears · 2 h 18 min
    Jupiter 34° up · dark sky

Night of Sat 30 Jan

  1. Callisto's shadow crosses Jupiter
    18:45 enters → 23:30 leaves · 4 h 45 min
    Jupiter below the horizon
  2. Europa's shadow crosses Jupiter
    19:15 enters → 22:09 leaves · 2 h 54 min
    Jupiter 5° up · dark sky
  3. Europa crosses Jupiter
    19:50 enters → 22:42 leaves · 2 h 52 min
    Jupiter 12° up · dark sky
  4. Callisto eclipses Europa
    20:04 · 19.4 min
    42% of Europa covered · ≈0.6 mag fainter · Jupiter 15° up · dark sky
  5. Callisto crosses Jupiter
    21:24 enters → 02:00 leaves · 4 h 35 min
    Jupiter 33° 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.