Moon Phase Star Map
Your Night Sky With the Exact Moon Phase
Every OwnStarMap star map already includes the precise lunar phase — full, half, crescent, or new — for the date and place you choose. Calculated from the IAU lunar ephemeris, rendered next to 8,921 real stars.
What is a moon phase star map?
A moon phase star map shows the night sky on a chosen date and location, including the exact phase of the moon — full, half, crescent, or new — as it appeared overhead. At OwnStarMap, every personalized star map automatically includes the precise moon phase calculated for your chosen date using the IAU lunar ephemeris. The moon's position in the sky and its illumination angle are rendered alongside 8,921 real stars from the HYG v4.2 catalog. Choose any date — your wedding night, your child's birthday, the night you proposed — and our configurator displays both the constellations visible and the moon as it actually appeared. Available as instant PDF download from ~$13.95 or premium FSC-certified print.
Why moon phases matter in a star map
The phase of the moon is more than astronomical trivia. On any given night it defines how dark the sky was, which stars were visible to the naked eye, and how the whole celestial composition felt overhead. A full moon washes out faint stars but flood the landscape in silver light. A new moon makes the Milky Way snap into view. A waning crescent at 3 AM has a quiet, almost private quality.
Symbolically, lunar phases carry meaning in dozens of cultures. Full moons mark harvest, fertility, completion. New moons signal beginnings and intentions. The exact phase on a meaningful date — a birth, a wedding, a turning point — becomes part of that memory. A star map that captures both the constellations and the precise moon phase tells the full story of the sky on that night, not just half of it.
For a deeper look at lunar phases throughout the year, our full moon calendar for 2026 lists every full moon date with its traditional name.
How we calculate the exact moon phase for your date
The moon's phase at any moment depends on the angular relationship between the Sun, Earth, and Moon. We compute that relationship using the standard IAU lunar ephemeris — the same celestial model used by professional planetariums and astronomy software like Stellarium.
For your chosen date and time, the configurator first converts the local civil time to UTC, then to Julian Date, then computes the moon's ecliptic longitude relative to the Sun. The phase angle gives the percentage of the lunar disc illuminated and the orientation of the terminator. The moon's right ascension and declination are then transformed into local sidereal coordinates so the disc lands in the correct spot on your sky.
The result: sub-degree positional accuracy and correct illumination geometry for any date from 1900 onward. Compared against NASA's Horizons ephemeris system, our renderings consistently stay within a fraction of a degree.
Common moon phases to look for
New moon (0% illuminated)
The moon is between Earth and the Sun, invisible to the eye. The night sky is at its darkest and faint stars and the Milky Way appear strongest. A great pick if you want a star-dense print.
Waxing crescent (1–49% growing)
A thin to half-illuminated sliver visible in the western sky after sunset. Often associated with new beginnings, intentions, and growth. Soft, hopeful aesthetic.
First quarter (50% illuminated)
Exactly half-lit, with the right side bright (Northern Hemisphere). High in the sky at sunset and sets around midnight. Balanced and architectural in a print.
Waxing gibbous (51–99% growing)
More than half-lit and growing toward full. Visible most of the night. Common phase for late-summer evenings and one of the most photogenic on a star map.
Full moon (100% illuminated)
The moon is opposite the Sun, fully lit, rises at sunset and sets at sunrise. Visually dominant — washes out faint stars but lends romance and folklore to any date.
Waning gibbous (99–51% shrinking)
More than half-lit but on its way down. Rises after sunset, dominates the late-night sky. The post-full moon — reflective, settled.
Last quarter (50% illuminated)
Exactly half-lit, with the left side bright (Northern Hemisphere). Rises around midnight, visible in the morning sky. Quiet and meditative.
Waning crescent (49–1% shrinking)
Thin sliver visible just before sunrise in the eastern sky. Often associated with release, rest, and surrender. Delicate, almost spectral on a print.
Popular dates with iconic moon phases
Full moon on a wedding date for extra romance
Couples who married under a full moon often want that detail preserved. A star map of the wedding night with a fully illuminated lunar disc reads as cinematic — pair it with a print of your anniversary night sky for a complete keepsake set.
New moon for darker, more star-filled skies
If your chosen date happened to fall on a new moon, the print shows the densest possible field of constellations. Customers who care more about the stars than about the moon often prefer this — every visible star carries the foreground alone.
Crescent moon for milestone birthdays
A waxing crescent is a popular symbolic choice for a birthday star map — particularly a first birthday or a coming-of-age date. The thin, growing sliver suits the narrative of a new life beginning.
Frequently asked questions
Can I order just the moon phase as a separate product?+
No — and that is on purpose. The moon phase is automatically included inside every OwnStarMap star map, calculated from the IAU lunar ephemeris for the exact date, time, and location you choose. There is no separate 'moon phase only' product because the moon is rendered alongside the 8,921 real stars and 88 constellations of the night sky, in correct relative position and illumination. Buying the star map for your date already gives you the precise moon phase that hung overhead.
What if my chosen date fell on a new moon — will the print look empty?+
Quite the opposite. A new moon night is the darkest possible sky, which means the constellations and Milky Way appear at their most prominent. The moon itself is rendered as a faint, unlit disc (its outline is preserved so you can still see where it was), and the rest of the sky comes alive. Many customers specifically pick new moon dates for that reason — fewer stars are washed out, and the celestial composition feels more dramatic.
How accurate is the moon's position and phase on the map?+
Sub-degree accurate. We compute the moon's right ascension, declination, and illumination fraction using the standard IAU lunar ephemeris (the same model used by professional planetariums and astronomy software). The phase angle, the percentage illuminated, and the orientation of the terminator (the line between lit and unlit halves) all match what was actually visible from your chosen ground location at your chosen time. Comparing against NASA's Horizons system, our renderings stay within a fraction of a degree.
Can I see the moon's name or symbol on the configurator?+
Yes. In the design configurator, the moon is labeled clearly next to its rendered disc — you will see something like 'Moon — Waxing Gibbous, 78% illuminated' alongside the date and location summary. The label is visible while you customize the print, so you can confirm the phase before checkout. On the final printed poster or PDF, the moon appears as a visual element of the sky and the phase information can optionally be included in the inscription area beneath the disc.
Does the moon block stars behind it in the rendering?+
It is rendered with subtle translucency so the constellations remain legible even where the moon disc overlaps them. In reality, the bright lit portion of the moon does mask faint stars near it, but on a printed art piece full visual fidelity to that effect would make the design look uneven. Our compromise: the moon is clearly visible and accurately positioned, but stars behind it are still drawn at slightly reduced opacity. The night sky still reads as one coherent composition.
See the sky and the moon as they actually were
Pick a date, a location, and a style. The exact lunar phase is calculated and rendered automatically. Digital PDF from ~$13.95. Premium FSC-certified prints available.
Create my moon phase star map