September 2026
Event cards are filtered for latitude, hemisphere, and basic visibility quality.
Space Observation Calendar
Do month-ahead astronomy calendars predict real sky events correctly when they are filtered for your location, local time, and hemisphere?
Location-Filtered Summary
For 52.37 deg N and 4.90 deg E, this month currently shows 12 filtered events.
12 visible or global0 limited11 global-scope1 location-sensitive0 not favored before filtering
Why Future Events Are Predictable
Future sky events can be predicted because the globe-Earth model gives one coherent geometry for Earth rotation, orbital motion, latitude, longitude, and horizon direction. Once you know where an observer is on Earth and when an event occurs, you can calculate whether it should be above the horizon, which part of the sky it should appear in, and how local clock time shifts that event for different places.
- Moon phases repeat on a predictable cycle because the Sun-Earth-Moon geometry changes in a regular way.
- Meteor-shower usefulness changes by latitude because the radiant climbs to different heights in different skies.
- Equinoxes, solstices, and daylight extremes differ by hemisphere exactly because Earth is tilted and rotating.
- That is why a useful calendar must convert one celestial event into local rise and set conditions, local darkness, and local viewing direction.
Upcoming 5 Events
This table starts from today, then follows the current location, category, and visibility filters. Clicking a row syncs the month view below.
| Date | Event | Scope | Visibility | Category | Links |
|---|---|---|---|---|---|
| Sep 25, 2026 | Full Moon | Global | Global Event | Moon | |
| Sep 28, 2026 | Waning Gibbous | Global | Global Event | Moon | |
| Oct 2, 2026 | Last Quarter | Global | Global Event | Moon | |
| Oct 2, 2026 | Dark-Sky Window | Global | Global Event | Moon | |
| Oct 6, 2026 | Waning Crescent | Global | Global Event | Moon |
Month View
Click a date to narrow the event list. Cell tint shows whether a day is global, local, or mixed after the current filters.
Global-scope dayLocation-sensitive dayMixed day
Sun
Mon
Tue
Wed
Thu
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Sat
Events In September 2026
This is a built-in observation planner. For exact conjunction times or satellite passes, pair it with a live sky app or astronomy calendar.
Dark-Sky Window
Sep 2, 2026
MoonGlobalGlobal Event
Dark-sky window near new Moon. This is usually the best part of the month for faint stars, Milky Way structure, and deep-sky observing.
Best window: Best in the nights nearest the new Moon, especially well after twilight.
Location note: This window is globally useful, but how dark the sky feels still depends on local twilight, weather, and light pollution.
Last Quarter
Sep 3, 2026
MoonGlobalGlobal Event
The Moon shows a half-lit morning phase and is highest after midnight into dawn.
Best window: Most noticeable after midnight into the morning sky.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
Waning Crescent
Sep 6, 2026
MoonGlobalGlobal Event
The Moon's geometry changes in a predictable monthly cycle.
Best window: Visible sometime during the month.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
New Moon
Sep 10, 2026
MoonGlobalGlobal Event
The Moon lies near the Sun in the sky, creating the darkest nights of the month for deep-sky observing.
Best window: Best for deep-sky observing in the nights around this date.
Location note: This is a global phase event, but your local weather and horizon still determine whether the nearby crescent is easy to catch.
Waxing Crescent
Sep 14, 2026
MoonGlobalGlobal Event
The Moon's geometry changes in a predictable monthly cycle.
Best window: Visible sometime during the month.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
Milky Way Viewing Window
Sep 14, 2026
SeasonalLocalBest Here
Milky Way season window. This is a location-sensitive observing season rather than a single global event, and it depends strongly on darkness and hemisphere.
Best window: Best after evening twilight under dark skies when the Moon is not washing out the galactic band.
Location note: Northern observers usually get their strongest evening Milky Way season from late spring into late summer.
First Quarter
Sep 17, 2026
MoonGlobalGlobal Event
The Moon shows a half-lit evening phase and stays high during the first half of the night.
Best window: Most noticeable from afternoon through late evening.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
Moonlit-Sky Window
Sep 17, 2026
MoonGlobalGlobal Event
Bright-moon window near full Moon. Useful for lunar observing, but less favorable for faint meteors and deep-sky objects.
Best window: Most noticeable in the nights around full Moon.
Location note: This affects the whole world, but local moonrise and moonset still control when the bright sky is most noticeable from your location.
Waxing Gibbous
Sep 21, 2026
MoonGlobalGlobal Event
The Moon's geometry changes in a predictable monthly cycle.
Best window: Visible sometime during the month.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
September Equinox
Sep 22, 2026
SeasonalGlobalGlobal Event
Solar declination is near zero, so sunrise and sunset trend closer to due east and due west than at other times of year.
Best window: Check sunrise or sunset bearings within a few days of the event.
Location note: This marks the northern shift into autumn and the southern shift into spring. For quick planning, your longitude is roughly near UTC+0.
Full Moon
Sep 25, 2026
MoonGlobalGlobal Event
The Moon sits opposite the Sun and brightens most of the night sky.
Best window: Visible from around sunset through sunrise.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
Waning Gibbous
Sep 28, 2026
MoonGlobalGlobal Event
The Moon's geometry changes in a predictable monthly cycle.
Best window: Visible sometime during the month.
Location note: This phase happens globally, but its rise and set times still shift with location and local horizon.
Why Flat-Earth Models Struggle
A flat-Earth explanation does not provide one stable geometric framework that can predict the same event correctly for different longitudes, latitudes, hemispheres, and local horizons at once. It can describe isolated observations after the fact, but it does not naturally produce one location-aware calendar that keeps working month after month.
- A single monthly event list still has to explain why some observers see an event high in the sky while others do not see it at all.
- It also has to explain why local clock times shift smoothly with longitude instead of changing in arbitrary ways.
- Seasonal sky changes, opposite hemispheric behavior, and horizon-limited visibility all fit a rotating globe more cleanly than a flat sky-dome story.
- If a model cannot generate reliable forward predictions for many locations from one geometry, it is weak as an explanatory calendar model.
How The Filter Works
- Global-scope events happen for everyone on Earth, but the local viewing experience still shifts with rise and set time, horizon, and weather.
- Location-sensitive events are explicitly colored differently in the calendar because latitude and hemisphere change how useful they are from your sky.
- Meteor showers are filtered more aggressively because radiant height changes with latitude and hemisphere.
- This planner is strongest as a location-aware observation shortlist, not as a replacement for a live planetarium or satellite-pass predictor.
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