Occult occultations, computed
Location

Jupiter's moons in April 2027

Io · Europa · Ganymede · Callisto — 7 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 · April 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

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

Mon
Tue
Wed
Thu
Fri
Sat
Sun
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5
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12
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19
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26
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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 Thu 1 Apr

  1. Io in Jupiter's shadow
    disappears unseen → 19:57 reappears · 2 h 18 min
    Jupiter 71° up · dark sky

Night of Fri 2 Apr

  1. Europa behind Jupiter
    21:30 disappears → reappears unseen · 2 h 52 min
    Jupiter 76° up · dark sky
  2. Europa in Jupiter's shadow
    disappears unseen → 02:26 reappears · 2 h 50 min
    Jupiter 14° up · dark sky

Night of Sat 3 Apr

  1. Ganymede's shadow crosses Jupiter
    18:21 enters → 21:54 leaves · 3 h 34 min
    Jupiter 53° up · daylight

Night of Sun 4 Apr

  1. Europa crosses Jupiter
    16:35 enters → 19:27 leaves · 2 h 53 min
    Jupiter 31° up · daylight
  2. Europa's shadow crosses Jupiter
    18:45 enters → 21:33 leaves · 2 h 48 min
    Jupiter 59° up · twilight

Night of Tue 6 Apr

  1. Io behind Jupiter
    23:59 disappears → reappears unseen · 2 h 18 min
    Jupiter 43° up · dark sky

Night of Wed 7 Apr

  1. Callisto's shadow crosses Jupiter
    18:46 enters → 23:17 leaves · 4 h 31 min
    Jupiter 62° up · twilight
  2. Io crosses Jupiter
    21:07 enters → 23:25 leaves · 2 h 18 min
    Jupiter 76° up · dark sky
  3. Io's shadow crosses Jupiter
    22:13 enters → 00:29 leaves · 2 h 17 min
    Jupiter 65° up · dark sky
  4. Callisto's shadow crosses Jupiter
    23:24 enters → 23:29 leaves · 5 min
    Jupiter 50° up · dark sky

Night of Thu 8 Apr

  1. Io in Jupiter's shadow
    disappears unseen → 21:52 reappears · 2 h 17 min
    Jupiter 68° up · dark sky

Night of Fri 9 Apr

  1. Europa behind Jupiter
    23:56 disappears → reappears unseen · 2 h 52 min
    Jupiter 41° up · dark sky

Night of Sat 10 Apr

  1. Ganymede crosses Jupiter
    17:44 enters → 21:22 leaves · 3 h 38 min
    Jupiter 51° up · daylight
  2. Ganymede's shadow crosses Jupiter
    22:19 enters → 01:51 leaves · 3 h 33 min
    Jupiter 61° up · dark sky
  3. Ganymede's shadow crosses Jupiter
    01:57 enters → 02:01 leaves · 4 min
    Jupiter 14° up · dark sky

Night of Sun 11 Apr

  1. Europa crosses Jupiter
    19:02 enters → 21:54 leaves · 2 h 53 min
    Jupiter 68° up · twilight
  2. Europa's shadow crosses Jupiter
    21:20 enters → 00:09 leaves · 2 h 49 min
    Jupiter 72° up · dark sky

Night of Tue 13 Apr

  1. Io behind Jupiter
    01:50 disappears → reappears unseen · 2 h 18 min
    Jupiter 12° up · dark sky

Night of Wed 14 Apr

  1. Io crosses Jupiter
    22:57 enters → 01:15 leaves · 2 h 18 min
    Jupiter 49° up · dark sky
  2. Io's shadow crosses Jupiter
    00:09 enters → 02:23 leaves · 2 h 14 min
    Jupiter 34° up · dark sky

Night of Thu 15 Apr

  1. Callisto behind Jupiter
    15:08 disappears → 19:56 reappears · 4 h 48 min
    Jupiter 22° up · daylight
  2. Io behind Jupiter
    20:18 disappears → reappears unseen · 2 h 18 min
    Jupiter 78° up · dark sky
  3. Io in Jupiter's shadow
    disappears unseen → 23:46 reappears · 2 h 17 min
    Jupiter 38° up · dark sky

Night of Fri 16 Apr

  1. Io crosses Jupiter
    17:25 enters → 19:43 leaves · 2 h 18 min
    Jupiter 52° up · daylight
  2. Io's shadow crosses Jupiter
    18:36 enters → 20:51 leaves · 2 h 15 min
    Jupiter 67° up · daylight

Night of Sat 17 Apr

  1. Ganymede crosses Jupiter
    21:29 enters → 01:07 leaves · 3 h 38 min
    Jupiter 66° up · dark sky

Night of Sun 18 Apr

  1. Europa crosses Jupiter
    21:31 enters → 00:24 leaves · 2 h 53 min
    Jupiter 64° up · dark sky
  2. Europa's shadow crosses Jupiter
    23:57 enters → 02:45 leaves · 2 h 48 min
    Jupiter 33° up · dark sky

Night of Tue 20 Apr

  1. Europa in Jupiter's shadow
    disappears unseen → 20:57 reappears · 2 h 50 min
    Jupiter 70° up · dark sky

Night of Wed 21 Apr

  1. Ganymede in Jupiter's shadow
    16:19 disappears → 19:55 reappears · 3 h 36 min
    Jupiter 42° up · daylight
  2. Io occults Ganymede
    20:46 · 3.5 min
    4% of Ganymede covered · ≈0.0 mag fainter · Jupiter 71° up · dark sky
  3. Io crosses Jupiter
    00:49 enters → 03:07 leaves · 2 h 18 min
    Jupiter 19° up · dark sky

Night of Thu 22 Apr

  1. Io behind Jupiter
    22:10 disappears → reappears unseen · 2 h 18 min
    Jupiter 53° up · dark sky

Night of Fri 23 Apr

  1. Io crosses Jupiter
    19:17 enters → 21:35 leaves · 2 h 18 min
    Jupiter 78° up · dusk
  2. Io's shadow crosses Jupiter
    20:31 enters → 22:48 leaves · 2 h 16 min
    Jupiter 72° up · dark sky
  3. Callisto crosses Jupiter
    01:07 enters → 05:52 leaves · 4 h 45 min
    Jupiter 13° up · dark sky

Night of Sat 24 Apr

  1. Io in Jupiter's shadow
    disappears unseen → 20:10 reappears · 2 h 17 min
    Jupiter 75° up · dark sky
  2. Ganymede occults Io
    21:30 · 4.1 min
    23% of Io covered · ≈0.1 mag fainter · Jupiter 60° up · dark sky
  3. Ganymede crosses Jupiter
    01:17 enters → 04:56 leaves · 3 h 38 min
    Jupiter 10° up · dark sky

Night of Sun 25 Apr

  1. Europa crosses Jupiter
    00:02 enters → 02:55 leaves · 2 h 53 min
    Jupiter 26° up · dark sky

Night of Tue 27 Apr

  1. Europa in Jupiter's shadow
    disappears unseen → 23:33 reappears · 2 h 50 min
    Jupiter 31° up · dark sky

Night of Wed 28 Apr

  1. Ganymede in Jupiter's shadow
    20:20 disappears → 23:55 reappears · 3 h 35 min
    Jupiter 71° up · dark sky
  2. Io occults Ganymede
    23:32 · 3.2 min
    5% of Ganymede covered · ≈0.0 mag fainter · Jupiter 30° up · dark sky

Night of Thu 29 Apr

  1. Io behind Jupiter
    00:03 disappears → reappears unseen · 2 h 18 min
    Jupiter 22° up · dark sky

Night of Fri 30 Apr

  1. Io crosses Jupiter
    21:11 enters → 23:29 leaves · 2 h 18 min
    Jupiter 59° up · dark sky
  2. Io's shadow crosses Jupiter
    22:26 enters → 00:41 leaves · 2 h 15 min
    Jupiter 43° 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.