For those tracking the night sky this month, the visual appearance of the moon is influenced by its position within its elliptical orbit. The moon does not follow a perfect circle around Earth; instead, it moves in a slightly elliptical orbit. This variance in distance means that not every full moon is identical in scale or luminosity.
The Geometry of the Micromoon
The specific phenomenon occurring with this year’s Flower Moon is tied to a point known as apogee. According to the BBC, apogee is the farthest point in the moon’s orbit from Earth. When a full moon coincides with this position, it is classified as a micromoon.
The delta between apogee and perigee—the moon’s closest approach—is approximately 43,000km (26,000 miles). While this distance is numerically large, the impact on human perception is minimal. The BBC reports that the change in size is barely noticeable to the naked eye and is primarily evident in photographs. The result is a lunar disk that appears slightly smaller and may be a touch less bright than a standard full moon.
This orbital variance is a result of the elliptical path the moon takes around Earth. While the Flower Moon marks the fifth full moon of 2026, its physical presence in the sky is a product of its specific coordinate in that elliptical path.
Capturing the Galactic Center
As the lunar glow fades toward the middle of the month, the window for high-contrast deep-space observation opens. On May 16, a new moon will provide the ideal dark-sky conditions required to view the Milky Way core. According to National Geographic, this is the optimal time for photography, as there is no lunar light to wash out the stars.
Observers should look for the galactic center rising around 11 p.m., though exact timing depends on local coordinates. The core remains visible until the pre-dawn hours. For those with access to national parks or other remote areas with minimal light pollution, the galactic center will appear at its brightest.
The dark-sky conditions provided by the new moon are also beneficial for those using telescopes to target distant galaxies. National Geographic identifies the Whirlpool Galaxy, located near the handle of the Big Dipper, and the Sombrero Galaxy, situated close to the star Spica, as two of the most accessible targets for telescopic viewing during this window.
Planetary Alignments and the Western Horizon
The astronomical calendar shifts from deep-space targets to planetary conjunctions on the evening of May 18. Just after sunset, the crescent moon and Venus—the brightest planet in the sky—will form a tight pair above the western horizon, according to National Geographic.
This pairing will remain visible for roughly 2 hours. During this same window, other planetary bodies will be positioned in the west. Mercury can be spotted above the horizon as the sky darkens, while Jupiter will be visible above the moon-Venus conjunction. Observers using optical aids are cautioned to point their equipment west only after the sun has fully set to avoid equipment damage.
These celestial events occur as different bodies move through their respective orbits. From the perspective of an observer on Earth, these paths occasionally overlap or appear close together, creating these brief, high-visibility windows for observers.
The Rare Lunar Cycle and Stellar Navigation
May 2026 concludes with a rare lunar event on May 31: a second full moon within a single calendar month. This is commonly referred to as a blue moon. NASA indicates that this occurrence happens approximately once every two to three years. Despite the name, the moon will not actually appear blue; it may instead appear yellowish when positioned near the horizon. Actual blue lunar tints typically only occur when the atmosphere contains specific particles, such as volcanic ash.
Throughout the month, Jupiter remains a constant fixture in the western sky, serving as a reliable navigational tool for locating the constellation Gemini. The planet sits near Pollux and Castor, the two brightest stars in the constellation. While the Big Dipper can also be used to find Gemini, National Geographic notes that Jupiter provides a more straightforward visual cue for observers this month.
For those tracking the Flower Moon’s specific rise times, the BBC Sky at Night Magazine provides a global timetable. In New York City, the moon rose at 20:16 local time on 1 May, while in London it appeared at 20:46 and in Tokyo at 17:46.
Observers should now look toward the May 16 new moon for the best Milky Way visibility, followed by the May 18 conjunction of Venus and the crescent moon in the western sky.