AI prompt to understand moon phases
AI prompt explaining moon phases with Earth-Sun-Moon geometry, phase names, and how to spot each in the night sky. Add your location and level.
Act as a patient astronomy tutor who explains moon phases to a curious beginner without jargon.
I want to understand moon phases. Here is my situation:
- Level: [COMPLETE BEGINNER OR WHAT YOU ALREADY KNOW]
- Hemisphere: [NORTHERN, SOUTHERN, OR UNSURE]
- Location: [CITY OR REGION, OR GENERAL]
- Goal: [PASS A TEST, TEACH A CHILD, STARGAZE, OR OTHER]
- Confusion: [WHAT TRIPS YOU UP, E.G. WAXING VS WANING, WHY NOT A SHADOW]
- Photo: [ATTACHING A MOON PHOTO FROM LAST NIGHT, YES OR NO]
If I attached a moon photo, name the likely phase, which side is lit for [HEMISPHERE], and what to check on the next clear night. If there is no photo, work from my written answers only.
Return:
1. A plain-language cause of moon phases (Sun, Earth, Moon geometry). State what is not causing them
2. The eight named phases in order, with one sentence each on how much of the lit face we see from Earth
3. A simple ASCII or text diagram of the Moon orbiting Earth and where sunlight hits at new moon and full moon
4. How to tell waxing from waning from the sky in [HEMISPHERE], including which side is lit
5. A memory trick for the phase order and for "waxing" vs "waning"
6. A seven-night observation plan I can follow with naked eyes, noting what to look for each night if weather allows
7. Three common misconceptions matched to the correction
Use short paragraphs. Define terms the first time you use them. Do not assume I own a telescope.
How to use
- Put your real sticking point in [CONFUSION]. Ask for one extra diagram if waxing vs waning still feels fuzzy.
- Set [HEMISPHERE] correctly. The lit side of the crescent points differently north vs south of the equator.
- After a night outside, attach a phone photo if your chat tool accepts images. Set [PHOTO] to yes. Otherwise describe shape and which side was bright in a follow-up.
Tips
- Check moonrise and moonset times for your city. Phases make more sense when you know when the Moon is up.
- A quarter Moon is often highest around sunset or sunrise, not at midnight.
- Photograph the Moon on several nights with the same zoom. Attach the latest shot and ask which phase it shows.
For best results, give your AI access to:web search, image input
Example output
Cause
Moon phases come from how much of the Moon's sunlit half faces Earth as the Moon orbits us. Earth's shadow on the Moon is a different event (lunar eclipse), not the monthly cycle.
Eight phases (order)
1. New: lit side faces away. Moon near Sun in the sky, hard to see
2. Waxing crescent: thin slice grows on the west side (northern view)
...
Text diagram (simplified)
Sun ----> Earth <---- Moon (new: Moon between Sun and Earth)
Sun ----> Moon ----> Earth (full: Earth between Sun and Moon)
Waxing vs waning (northern hemisphere)
Waxing: lit part grows, bright on the right in evening sky. Waning: lit part shrinks, bright on the left.
Seven-night plan
Night 1: Find sunset time. Note if a thin crescent sits low in the west...
Misconception
"The Earth's shadow makes the phases" -> No. Phases are the changing angle of sunlight on the Moon as it orbits Earth.