What do I need to use Sun and Moon?

Location; The date; The real question.

Is Sun and Moon free to use?

Yes — run it free in the browser playground (no API key needed for the sponsored trial, or bring any provider key), or install it into Claude Code, Cursor, ChatGPT and more via npx pm-claude-skills. MIT-licensed and open source.

Sun and Moon

Q: How do I know the Sun and Moon output is good?

The skill verifies itself against its own quality checks: Every time is explicitly local to the location, with the zone named; `formatted=0` was used and UTC→local conversion applied (or timezone=auto took care of it); The asked-for window (golden hour, last light) leads the answer; Moon phase carries its name, not just an emoji.

🔵 Stable🕐 updated 2026-07-18 🔷 SkillSpec L3 pm-live

Get sunrise, sunset, golden hour, day length, and moon phase for any location with zero API keys — sunrise-sunset.org and Open-Meteo via curl, times converted to local. Use when asked when is sunset today, golden hour for a photo shoot, how long is the day, what's the moon phase tonight, or sun times for a date and place. Produces the sun/moon times in the user's local zone (the UTC trap handled), the photography windows, and the rerunnable command.

▶ Run it free — no key needed 📝 Grade your existing draft View SKILL.md ↗

What to give it

▸Location — lat/lon or a place name (geocode via `https://geocoding-api.open-meteo.com/v1/search?name=Lisbon&count=1`)

▸The date — today default; any date works (both services take past and future dates)

▸The real question — a shoot wants golden hour, a hike wants last-light, "is it a full moon" wants the phase — lead with theirs

✅ The bar it holds itself to

Every skill in this library self-verifies — these are this skill's own quality checks, straight from its definition.

✓Every time is explicitly local to the location, with the zone named

✓`formatted=0` was used and UTC→local conversion applied (or timezone=auto took care of it)

✓The asked-for window (golden hour, last light) leads the answer

✓Moon phase carries its name, not just an emoji

✓Computed values (moon %, golden hour) are labeled as derived

⚠️ What it refuses to do

Do not serve UTC times as local — the single failure mode this skill exists to prevent

Do not answer from memory — sun times shift daily and by latitude dramatically

Do not give bare sunset when the question was a photography or safety window

Do not overstate moon precision — phase and rough illumination, not fake decimals

Do not ignore polar edge cases — high latitudes in summer/winter return no-sunset/no-sunrise; report that as the (correct) answer, not an error

Install

npx pm-claude-skills add --agent claude   # or codex · cursor · gemini · hermes
# or one-line MCP (every skill, any client):
claude mcp add pm-skills -- npx -y pm-claude-skills-mcp

Related skills

🔌 Embed this skill

Drop this on your blog, docs, or site — it renders a "Run this skill" card:

<div data-pm-skill="sun-and-moon"></div>
<script src="https://mohitagw15856.github.io/pm-claude-skills/embed.js" async></script>

💬 Discussion

Sun and Moon is one of 599 open-source professional AI agent skills — all SkillSpec L3. Try them all in the browser · ⭐ Star on GitHub · Browse the full catalog