2027 Astronomy Calendar

View major astronomical events in 2027, including meteor showers, eclipses, lunar phases, planetary oppositions, and notable skywatching dates.

Geomagnetic Activity and Aurora Index

Taiwan and Hong Kong are normally far too low in geomagnetic latitude for aurora. Even Hokkaido generally needs an extreme Kp≥8 storm for a chance of low-latitude aurora. Use this mainly for overseas aurora and photography planning.

Aurora Forecast · Source: NOAA Space Weather Prediction Center

Comets to Track in 2027

Brightness ranges are site estimates based on available data, not guarantees. Comets can outburst, fade, or fragment, so regenerate a current ephemeris before observing. This first version uses NASA/JPL orbital data only and does not use COBS.

104P/Kowal 2

Perihelion: 2027-10-12 · Estimated magnitude range: 10–12

A roughly magnitude 10–12 small-telescope target in autumn 2027. Its altitude changes quickly by month, so generate a local JPL or planetarium ephemeris close to the observing date.

View NASA/JPL SBDB orbital data

C/2024 T5 (ATLAS)

Perihelion: 2027-05-06 · Estimated magnitude range: 12–14

Its perihelion remains about 3.84 AU from the Sun, making it a faint imaging or medium/large-telescope target rather than a naked-eye comet. It is listed as a 2027 tracking target, not a “great comet” prediction.

View NASA/JPL SBDB orbital data

Comets: from icy nucleus to extreme orbit

Month 1

• 2027-01-03 · Meteor Shower — Quadrantids (ZHR≈120) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1
• 2027-01-10 · Planetary retrograde — Mars retrograde: first station Learn how it forms

Major moon phases — New Moon 2027-01-08 · First Quarter 2027-01-16 · Full Moon 2027-01-22 · Last Quarter 2027-01-29 View observing information

Month 2

• 2027-02-06 · Eclipse — Annular Solar Eclipse · Taiwan: not visible View observing information · Learn how it forms · Source 1 · Source 2
• 2027-02-10 · Planetary retrograde — Mercury retrograde: first station Learn how it forms
• 2027-02-11 · Planetary opposition — Jupiter at opposition Learn how it forms
• 2027-02-19 · Planetary opposition — Mars at opposition Learn how it forms
• 2027-02-20 · Eclipse — Penumbral Lunar Eclipse · Taiwan: visible View observing information · Learn how it forms · Source 1 · Source 2

Major moon phases — New Moon 2027-02-06 · First Quarter 2027-02-14 · Full Moon 2027-02-21 · Last Quarter 2027-02-28 View observing information

Month 3

• 2027-03-21 · Equinox — Vernal Equinox · Reviewed year-specific source Source 1

Major moon phases — New Moon 2027-03-08 · First Quarter 2027-03-16 · Full Moon 2027-03-22 · Last Quarter 2027-03-30 View observing information

Month 4

• 2027-04-22 · Meteor Shower — Lyrids (ZHR≈20) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1

Major moon phases — New Moon 2027-04-07 · First Quarter 2027-04-14 · Full Moon 2027-04-21 · Last Quarter 2027-04-29 View observing information

Month 5

• 2027-05-06 · Meteor Shower — Eta Aquariids (ZHR≈50) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1

Major moon phases — New Moon 2027-05-06 · First Quarter 2027-05-13 · Full Moon 2027-05-20 · Last Quarter 2027-05-28 View observing information

Month 6

• 2027-06-11 · Planetary retrograde — Mercury retrograde: first station Learn how it forms
• 2027-06-21 · Solstice — Summer Solstice · Reviewed year-specific source Source 1

Major moon phases — New Moon 2027-06-05 · First Quarter 2027-06-11 · Full Moon 2027-06-19 · Last Quarter 2027-06-27 View observing information

Month 7

• 2027-07-10 · Planetary retrograde — Neptune retrograde: first station Learn how it forms
• 2027-07-18 · Eclipse — Penumbral Lunar Eclipse · Taiwan: not visible View observing information · Learn how it forms · Source 1 · Source 2
• 2027-07-28 · Meteor Shower — Delta Aquariids (ZHR≈25) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1

Major moon phases — New Moon 2027-07-04 · First Quarter 2027-07-11 · Full Moon 2027-07-18 · Last Quarter 2027-07-27 View observing information

Month 8

• 2027-08-02 · Eclipse — Total Solar Eclipse · Taiwan: not visible View observing information · Learn how it forms · Source 1 · Source 2
• 2027-08-10 · Planetary retrograde — Saturn retrograde: first station Learn how it forms
• 2027-08-12 · Meteor Shower — Perseids (ZHR≈100) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1
• 2027-08-17 · Eclipse — Penumbral Lunar Eclipse · Taiwan: not visible View observing information · Learn how it forms · Source 1 · Source 2

Major moon phases — New Moon 2027-08-02 · First Quarter 2027-08-09 · Full Moon 2027-08-17 · Last Quarter 2027-08-25 View observing information

Month 9

• 2027-09-15 · Planetary retrograde — Uranus retrograde: first station Learn how it forms
• 2027-09-23 · Equinox — Autumnal Equinox · Reviewed year-specific source Source 1
• 2027-09-28 · Planetary opposition — Neptune at opposition Learn how it forms

Major moon phases — New Moon 2027-09-01 · First Quarter 2027-09-08 · Full Moon 2027-09-16 · Last Quarter 2027-09-23 · New Moon 2027-09-30 View observing information

Month 10

• 2027-10-07 · Planetary retrograde — Mercury retrograde: first station Learn how it forms
• 2027-10-18 · Planetary opposition — Saturn at opposition Learn how it forms
• 2027-10-21 · Meteor Shower — Orionids (ZHR≈20) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1

Major moon phases — First Quarter 2027-10-07 · Full Moon 2027-10-15 · Last Quarter 2027-10-23 · New Moon 2027-10-29 View observing information

Month 11

• 2027-11-17 · Meteor Shower — Leonids (ZHR≈15) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1
• 2027-11-30 · Planetary opposition — Uranus at opposition Learn how it forms

Major moon phases — First Quarter 2027-11-06 · Full Moon 2027-11-14 · Last Quarter 2027-11-21 · New Moon 2027-11-28 View observing information

Month 12

• 2027-12-13 · Meteor Shower — Geminids (ZHR≈150) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1
• 2027-12-22 · Meteor Shower — Ursids (ZHR≈10) · Nominal annual baseline (date and ZHR await the annual forecast) View observing information · Source 1
• 2027-12-22 · Solstice — Winter Solstice · Reviewed year-specific source Source 1

Major moon phases — First Quarter 2027-12-06 · Full Moon 2027-12-14 · Last Quarter 2027-12-20 · New Moon 2027-12-28 View observing information

2026 · 2028

Related tools: Moon Phases · Tide Forecast · Go Timing