The Moon at perigee

The Moon will reach the closest point along its orbit to the Earth and will appear slightly larger than at other times.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 18:58
• Bogota: 19:58
• Madrid: 02:58 (September 28)

Lunar occultation of Antares (Alpha Scorpii)

The Moon will pass in front of Antares (Alpha Scorpii), creating a lunar occultation visible from parts of East Asia. Due to the closeness of the Moon to the Earth, a lunar occultation is not visible all the world.

Visibility: Visible with binoculars

Observing time:

• Mexico City: not observable
• Bogota: not observable
• Madrid: not observable

NGC 55 well placed

The barred irregular galaxy NGC 55 will be well placed, high in the sky. It will reach its highest point in the sky in the constellation of Sculptor at around midnight local time.

Visibility: Visible with a 4 inch telescope

Observing time:

• Mexico City: 22:08 - 03:03
• Bogota: 20:05 - 03:38
• Madrid: not observable

Conjunction of Moon and Mars

Moon and Mars will share the same right ascension, with Moon passing 0º39' to the north of Mars.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 07:46 - 19:38
• Bogota: 07:01 - 19:03
• Madrid: 09:34 - 21:08

Daytime Sextantid meteor shower 2023

The Daytime Sextantid meteor shower 2023 will be active from September 9 to October 9, producing its peak rate of meteors around September 28. It will be best seen around the constellation of Sextans.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 04:13 - 06:02
• Bogota: 03:33 - 05:21
• Madrid: 05:52 - 07:37

ε-Perseid meteor shower 2023

The ε-Perseid meteor shower 2023 will be active from September 5 to September 21, producing its peak rate of meteors around September 9. It will be best seen around the constellation of Perseus.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 21:23 - 05:58
• Bogota: 21:37 - 05:25
• Madrid: 21:06 - 07:18

Moon at perihelion

Moon will reach the closest point along its orbit to the Sun, at a distance of 1.0029 AU.

Visibility: Not observable

Venus at greatest brightness

Venus will reach its greatest brightness in its 2023 - 2024 morning apparition. It will be shining brightly at mag -4.5.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 03:35 - 06:22
• Bogota: 03:07 - 05:44
• Madrid: 04:48 - 07:55

Mercury at dichotomy

Mercury will reach half phase in its September - October 2023 morning apparition. It will be shining brightly at mag -0.5.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 05:07 - 06:23
• Bogota: 04:36 - 05:43
• Madrid: 06:29 - 08:00

Moon at First Quarter

The Moon will pass first quarter phase, during this time it appears almost exactly half illuminated.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 13:07 - 23:45
• Bogota: 11:53 - 23:39
• Madrid: 15:50 - 00:21

Mercury at highest altitude in morning sky

Mercury will reach its highest point in the sky in its September - October 2023 morning apparition. It will be shining brightly at mag -0.5.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 05:07 - 06:23
• Bogota: 04:36 - 05:43
• Madrid: 06:29 - 08:00 (September 23)

Mercury at greatest elongation west

Mercury will reach its greatest separation from the Sun in its September - October 2023 morning apparition. It will be shining brightly at mag -0.5.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 05:07 - 06:23
• Bogota: 04:36 - 05:43
• Madrid: 06:29 - 08:00

Neptune reaches opposition

Neptune will reach opposition and will be visible for much of the night, when it lies opposite to the Sun in the sky in the constellation of Pisces.

Visibility: Visible with a small telescope

Observing time:

• Mexico City: 20:10 - 04:53
• Bogota: 19:17 - 04:18
• Madrid: 22:20 - 06:02

Moon at aphelion

Moon will reach the furthest point along its orbit to the Sun, at a distance of 1.0045 AU

Visibility: Not observable

47 Tuc well placed

The second brightest globular cluster in the sky 47 Tuc (NGC 104) will be well placed, high in the sky. It will reach its highest point in the sky in the constellation of Tucana at around midnight local time.

Visibility: Visible with binoculars

Observing time:

• Mexico City: not observable
• Bogota: not observable
• Madrid: not observable

Mercury at solar inferior conjunction

Mercury will pass very close to the Sun in the sky as its orbit carries it between the Sun and Earth. At closest approach, it will appear at a separation of only 3º45' from the Sun.

Visibility: Not observable

Moon at Last Quarter

The Moon will pass last quarter phase, during this time it appears almost exactly half illuminated.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 23:39 - 13:05
• Bogota: 23:30 - 11:54
• Madrid: 00:14 - 15:41 (September 7)

Lunar occultation of Beta Tauri (Elnath)

The Moon will pass in front of Beta Tauri (Elnath), creating a lunar occultation visible from the southern Pacific Ocean. Due to the closeness of the Moon to the Earth, a lunar occultation is not visible all the world.

Visibility: Visible with binoculars

Observing time:

• Mexico City: not observable
• Bogota: not observable
• Madrid: not observable

Moon at apogee

The Moon will reach the furthest point along its orbit to the Earth and will appear slightly smaller than at other times.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 09:42
• Bogota: 10:42
• Madrid: 17:42

Full Moon

The Moon will be almost exactly on the other side of the Sun and will appear fully illuminated.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 18:11 - 06:35
• Bogota: 18:12 - 06:43
• Madrid: 19:47 - 07:56

Jupiter enters retrograde motion

Jupiter will enter retrograde motion, halting its usual eastward movement through the constellations, and turning to move westwards instead.
This reversal of direction is a phenomenon cuased the change of perspective due to Earth's and the outer planet's position. It occurs a few months before they reach opposition.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 22:49 - 06:05
• Bogota: 22:24 - 05:34
• Madrid: 00:06 - 07:24

Aurigid meteor shower 2023

The Aurigid meteor shower 2023 will be active from August 28 to September 5, producing its peak rate of meteors around September 1. It will be best seen around the constellation of Auriga.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 00:48 - 05:56
• Bogota: 01:00 - 05:27
• Madrid: 00:38 - 07:10

Close approach of Moon and Saturn

Moon and Saturn will make a close approach, passing within 2º25' of each other in the sky.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 16:45 - 04:14
• Bogota: 15:51 - 03:48
• Madrid: 18:50 - 05:28 (September 27)

Conjunction of Moon and Jupiter

Moon and Jupiter will share the same right ascension, with Moon passing 3º18' to the north of Jupiter.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 22:11 - 11:00
• Bogota: 21:48 - 10:03
• Madrid: 23:18 - 13:11

Close approach of Moon and Jupiter

Moon and Jupiter will make a close approach, passing within 3º04' of each other in the sky.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 22:11 - 11:00
• Bogota: 21:48 - 10:03
• Madrid: 23:18 - 13:11

Conjunction of Moon and Saturn

Moon and Saturn will share the same right ascension, with Moon passing 2º38' to the south of Saturn.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 16:45 - 04:14
• Bogota: 15:51 - 03:48
• Madrid: 18:50 - 05:28 (September 27)

Conjunction of Moon and Mercury

Moon and Mercury will share the same right ascension, with Moon passing 5º59' to the north of Mercury.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: not observable
• Bogota: not observable
• Madrid: not observable

Close approach of Moon and The Pleiades (M45)

Moon and The Pleiades (M45) will make a close approach, passing within 1º06' of each other in the sky.

Visibility: Visible to the naked eye

Observing time:

• Mexico City: 22:47 - 12:05
• Bogota: 22:36 - 10:57
• Madrid: 23:32 - 14:39

New Moon

The Moon will pass close to the Sun and become lost in the its glare for a few days.

Visibility: Not observable

Lunar occultation of Neptune

The Moon will pass in front of Neptune, creating a lunar occultation visible from Antarctica. Due to the closeness of the Moon to the Earth, a lunar occultation is not visible all the world.

Visibility: Visible with a 4 inch telescope

Observing time:

• Mexico City: not observable
• Bogota: not observable
• Madrid: not observable

September Equinox

The September equinox marks the first day of autumn for the northern hemisphere and the first day of spring for the southern hemisphere. Day and night last almost exactly 12 hours.

Visibility: Not observable

Mercury at perihelion

Mercury will reach the closest point along its orbit to the Sun, at a distance of 0.31 AU.

Visibility: Not observable