Moon Calendar

The Moon doesn’t actually “change shape.” What changes is how much of its sunlit half we can see from Earth. As the Moon orbits our planet, the Sun–Earth–Moon geometry shifts — and that creates the familiar rhythm of phases: New Moon, waxing light, Full Moon, and waning light.

One full cycle from New Moon to New Moon is called a synodic month, about 29.5 days. That’s why New and Full Moon dates move a little every month. This calendar lists the exact phase moments (the instants when the Moon reaches New, First Quarter, Full, or Last Quarter), and shows them in your local time.

Waxing means the illuminated portion we see is growing (more light each night). Waning means it’s shrinking (less light each night). The “bright side” can appear on different sides depending on hemisphere and where the Moon is in the sky — but the phase itself is the same worldwide.

Why can the same phase show on different dates?
A phase happens at one exact moment globally, but your local date depends on timezone. If a phase occurs near midnight UTC, it may fall on different calendar dates in different regions. That’s why this page converts event times into your browser’s local time for practical planning.

The four main phases (astronomy, simply explained)

• New Moon: The Moon is between Earth and the Sun. The sunlit side faces away from us, so it looks dark.
• First Quarter: About half of the visible face is illuminated — roughly a quarter of the orbit completed since New Moon.
• Full Moon: Earth is between the Sun and Moon, so the Moon’s near side is fully illuminated.
• Last Quarter: About half illuminated again — now the cycle is moving toward New Moon.

Eclipses (why they’re rare)
Eclipses don’t happen every Full or New Moon because the Moon’s orbit is slightly tilted compared to Earth’s orbit around the Sun. Most months the alignment is close — but not exact — so the Moon passes above or below the shadow path. When the alignment is just right, you can get a lunar eclipse (at Full Moon) or a solar eclipse (at New Moon). If your database includes eclipse rows, they’ll appear in the calendar.

The Arvethis Insight approach (optional)
Arvethis treats lunar timing as a gentle monthly structure: check the phase, notice your inner weather, then choose one grounded next step. This is not prediction — it’s a reflection practice you can use if it helps.

• New Moon: name an intention, pick a theme, begin quietly.
• Waxing: build consistency, practice, take steady steps.
• Full Moon: review honestly, celebrate progress, release what’s heavy.
• Waning: simplify, close loops, rest, prepare for renewal.

Arvethis tip: If you want a one-minute prompt, pair a phase moment with a single Tarot pull (for reflection, not certainty). Keep it simple: one question, one insight, one gentle action.