Today's Moon

This tool computes the Moon's current phase, illuminated fraction, and age (days since the most recent New Moon) directly in your browser, using the same astronomical calculation library (astronomy-engine, a well-established implementation of high-precision lunar ephemeris algorithms) that powers every full-moon date and calendar page on this site.

Illumination is computed from the Moon's actual phase angle at this exact moment — the geocentric ecliptic longitude difference between the Moon and Sun — rather than approximated from a simple day-count average, which matters because the Moon's angular speed through its elliptical orbit genuinely varies enough that a linear day-count estimate would drift measurably from the real value over a lunation.

"Age" here means days since the most recent New Moon, found by searching backward for that exact astronomical instant rather than estimating from the average 29.53-day synodic month length — a small but real precision difference that keeps this number accurate throughout the whole lunar cycle, not just near its midpoint.

The phase name shown (one of the 8 conventional buckets, from New Moon through Waning Crescent) uses the same ±10° phase-angle windows documented on this site's phases section — so the label you see here will always match what that phase's own dedicated page describes, rather than using a different rounding rule in different parts of the site.

This reading is genuinely live in the sense that matters: reload the page at any point and it recomputes from your device's current date and time rather than serving a cached snapshot from whenever the page was last built — useful if you're checking back across a single evening to watch the illumination percentage tick upward or downward.

The illumination percentage shown updates meaningfully day to day rather than staying static for long stretches — near New or Full Moon the daily change is smaller (since illumination is near its floor or ceiling), while around the Quarter phases the percentage shifts fastest, roughly matching the same variable-rate pattern this site's phases section documents for each named stage of the cycle.

This tool deliberately shows only the current moment's snapshot rather than a forecast or calendar — for future dates, this site's Moon Phase on Any Date tool runs the identical underlying calculation against whatever date you specify instead of today's.

No account, download, or payment is required to use this or any tool on this site — it's a free, ad-supported utility built directly on the same astronomy core powering every reference page.

Bookmarking this specific page is a reasonable way to get a one-glance daily reading without needing to remember a phase manually from day to day.

Refreshing manually is more reliable than assuming a background auto-update, so reload the page directly whenever you want the absolute latest reading.

This same real-time approach applies to every reading this page produces, day or night, whenever you happen to load it.