Occult occultations, computed
Location

Jupiter's moons in May 2027

Io · Europa · Ganymede · Callisto — 9 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 · May 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

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

Mon
Tue
Wed
Thu
Fri
Sat
Sun
1221
3
415261728292101111121132
14
151164171
18
19
202
21
221234241
25
26
27
28
29
301311
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 1 May

  1. Io in Jupiter's shadow
    disappears unseen → 22:05 reappears · 2 h 17 min
    Jupiter 47° up · dark sky
  2. Ganymede occults Io
    00:14 · 4.6 min
    31% of Io covered · ≈0.2 mag fainter · Jupiter 18° up · dark sky

Night of Sun 2 May

  1. Callisto in Jupiter's shadow
    20:35 disappears → 01:06 reappears · 4 h 31 min
    Jupiter 65° up · dark sky

Night of Tue 4 May

  1. Europa behind Jupiter
    20:44 disappears → reappears unseen · 2 h 53 min
    Jupiter 62° up · dark sky

Night of Wed 5 May

  1. Ganymede behind Jupiter
    19:06 disappears → 22:46 reappears · 3 h 40 min
    Jupiter 77° up · twilight
  2. Ganymede in Jupiter's shadow
    00:19 disappears → 03:54 reappears · 3 h 35 min
    Jupiter 14° up · dark sky

Night of Thu 6 May

  1. Europa's shadow crosses Jupiter
    18:27 enters → 21:14 leaves · 2 h 47 min
    Jupiter 77° up · daylight

Night of Fri 7 May

  1. Io crosses Jupiter
    23:05 enters → 01:23 leaves · 2 h 18 min
    Jupiter 28° up · dark sky
  2. Io's shadow crosses Jupiter
    00:23 enters → 02:37 leaves · 2 h 14 min
    Jupiter 12° up · dark sky

Night of Sat 8 May

  1. Io behind Jupiter
    20:26 disappears → reappears unseen · 2 h 18 min
    Jupiter 62° up · dark sky
  2. Io in Jupiter's shadow
    disappears unseen → 00:00 reappears · 2 h 17 min
    Jupiter 16° up · dark sky

Night of Sun 9 May

  1. Io crosses Jupiter
    17:34 enters → 19:52 leaves · 2 h 18 min
    Jupiter 72° up · daylight
  2. Io's shadow crosses Jupiter
    18:50 enters → 21:05 leaves · 2 h 15 min
    Jupiter 77° up · daylight

Night of Mon 10 May

  1. Callisto crosses Jupiter
    18:45 enters → 23:31 leaves · 4 h 46 min
    Jupiter 77° up · daylight

Night of Tue 11 May

  1. Europa behind Jupiter
    23:20 disappears → reappears unseen · 2 h 53 min
    Jupiter 22° up · dark sky

Night of Wed 12 May

  1. Ganymede behind Jupiter
    23:06 disappears → 02:46 reappears · 3 h 40 min
    Jupiter 24° up · dark sky

Night of Thu 13 May

  1. Europa crosses Jupiter
    18:30 enters → 21:22 leaves · 2 h 52 min
    Jupiter 78° up · daylight
  2. Europa's shadow crosses Jupiter
    21:03 enters → 23:51 leaves · 2 h 49 min
    Jupiter 50° up · dark sky

Night of Sat 15 May

  1. Io behind Jupiter
    22:21 disappears → reappears unseen · 2 h 18 min
    Jupiter 32° up · dark sky

Night of Sun 16 May

  1. Ganymede's shadow crosses Jupiter
    18:17 enters → 21:46 leaves · 3 h 29 min
    Jupiter 78° up · daylight
  2. Io crosses Jupiter
    19:29 enters → 21:48 leaves · 2 h 18 min
    Jupiter 68° up · dusk
  3. Io's shadow crosses Jupiter
    20:47 enters → 23:01 leaves · 2 h 14 min
    Jupiter 52° up · dark sky
  4. Ganymede's shadow crosses Jupiter
    21:52 enters → 21:56 leaves · 4 min
    Jupiter 37° up · dark sky

Night of Mon 17 May

  1. Io in Jupiter's shadow
    disappears unseen → 20:24 reappears · 2 h 17 min
    Jupiter 56° up · dark sky

Night of Thu 20 May

  1. Europa crosses Jupiter
    21:07 enters → 23:59 leaves · 2 h 52 min
    Jupiter 44° up · dark sky
  2. Europa's shadow crosses Jupiter
    23:39 enters → 02:25 leaves · 2 h 47 min
    Jupiter 11° up · dark sky

Night of Sat 22 May

  1. Europa in Jupiter's shadow
    disappears unseen → 20:41 reappears · 2 h 50 min
    Jupiter 48° up · dark sky

Night of Sun 23 May

  1. Ganymede crosses Jupiter
    17:13 enters → 20:51 leaves · 3 h 39 min
    Jupiter 75° up · daylight
  2. Io crosses Jupiter
    21:26 enters → 23:44 leaves · 2 h 18 min
    Jupiter 38° up · dark sky
  3. Ganymede's shadow crosses Jupiter
    22:17 enters → 01:46 leaves · 3 h 29 min
    Jupiter 26° up · dark sky
  4. Io's shadow crosses Jupiter
    22:41 enters → 00:57 leaves · 2 h 16 min
    Jupiter 21° up · dark sky

Night of Mon 24 May

  1. Io in Jupiter's shadow
    disappears unseen → 22:19 reappears · 2 h 17 min
    Jupiter 25° up · dark sky

Night of Sun 30 May

  1. Ganymede crosses Jupiter
    21:21 enters → 01:00 leaves · 3 h 39 min
    Jupiter 33° up · dark sky

Night of Mon 31 May

  1. Io behind Jupiter
    20:44 disappears → reappears unseen · 2 h 18 min
    Jupiter 41° 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.