Exploring the Flower Moon and the Rare Blue Moon: Your Questions Answered
Discover the meaning behind May's Flower Moon and the rare Blue Moon on May 31, with detailed Q&A about these celestial events.
May's night sky offers a spectacular double feature: the beautiful Flower Moon and a rare Blue Moon on May 31. To help you understand these celestial events, we've answered the most common questions below. Dive in to learn about their names, timing, and how to enjoy them best.
What is the Flower Moon?
The Flower Moon is the traditional name for May's full moon. It gets its name from Native American and colonial sources, as May is when flowers bloom across much of North America. This full moon marks a time of abundance and renewal in nature. Astronomically, it is simply the full moon that occurs in May, rising opposite the sun and fully illuminated by sunlight. In 2025, the Flower Moon will occur on May 22 (date may vary by year).
Why is it called the Flower Moon? Link to definition
The name "Flower Moon" originates from Algonquian-speaking Native American tribes who used natural landmarks to track seasons. May is when spring flowers, such as wild roses, violets, and lilacs, are in full display. Some tribes also call it the "Planting Moon" or "Milk Moon" because it signals the start of agricultural planting and the period when cows give more milk. The name has been passed down through generations and is still used by astronomers and skywatchers today.
What is a Blue Moon?
A Blue Moon is a second full moon occurring within a single calendar month, or the third full moon in a season that has four full moons. The modern, popular definition is the second full moon in a month. This happens roughly every 2.5 to 3 years. On May 31, a rare Blue Moon will follow the Flower Moon on May 22, making May 2025 a month with two full moons. Despite the name, the moon does not actually appear blue; it remains its usual silvery-gray color unless atmospheric dust or smoke scatters light differently.
Why is the Blue Moon on May 31 considered rare?
The May 31 Blue Moon is rare because it marks the second full moon in May, a month that typically has only one. Such an event occurs approximately once every 2.7 years on average. Additionally, the Blue Moon on May 31 is notable because it falls at the very end of the month, making it a true "monthly" Blue Moon. Some definitions require the second full moon to occur within the same calendar month, which makes May 2025 a perfect example. The rarity of this event adds extra excitement for stargazers and photographers worldwide, as seen in the gorgeous photos captured during the Flower Moon earlier in the month.
How can I photograph the Flower Moon or Blue Moon? Learn about rarity
To capture stunning photos of the Flower Moon or Blue Moon, plan ahead. Use a camera with a telephoto lens (200mm or more) to get close-up shots that emphasize moon details like craters. For landscape shots, include foreground elements such as trees, buildings, or mountains to add scale. Use a tripod and set a low ISO (100–200) with a fast shutter speed to avoid blur from the moon's motion. For the Blue Moon on May 31, check local moonrise times and find a location with a clear horizon. Many photographers share their results online, creating a global gallery of beautiful moon images.
Will the Flower Moon and Blue Moon affect tides or human behavior?
Yes, both full moons can influence ocean tides. During a full moon, the sun, Earth, and moon are aligned, causing higher than normal spring tides. The Flower Moon and the subsequent Blue Moon will each produce slightly higher tides, which can be noticeable along coastlines. However, there is no scientific evidence that these moons directly affect human behavior, moods, or mental health, despite cultural myths. The term "lunacy" comes from the Latin word for moon, but modern research does not support a causal link. Enjoy the celestial show without worrying about unusual behavior!