Use Asterodos with your AI

Add it to Claude

1. Open Customize, then Connectors.
2. Choose Add custom connector.
3. Name it Asterodos, paste the address above as the server URL, and choose No sign-in if asked.
4. Click Add. In a chat, turn it on from the + menu under Connectors.

On a Team or Enterprise plan, an Owner adds it for the organization first. The free plan allows one custom connector.

Other assistants

Any assistant or app that supports remote MCP servers can use it: add the address above as a remote server (Streamable HTTP, no authentication). The menus differ from app to app; look for "connectors", "MCP" or "tools" in its settings.

What it can do

Almanac

GHA and declination of the Sun, Moon, planets, Aries and the 58 navigational stars for any second of 2026 to 2028, with the working.

Sextant corrections

Hs to Ho: index correction, dip and the main correction, step by step.

Sight reduction

Hc, Zn and the intercept, from the DR by formula and from an assumed position with Pub. 249 or Pub. 229.

Noon sight

The time of local noon, and latitude (and longitude) from the Sun at noon.

Tonight's stars

Twilight times and three well-spread stars to shoot, with their altitudes and bearings.

Practice problems

A fresh problem from the course on any topic, and a check of your answers that says which step went wrong and why.

Find a lesson

The course page that teaches what you are asking about, with its text.

Questions to try

• “What is the Sun's GHA and declination at 14:31:07 UT on 15 October 2026?”
• “My Hs was 35° 10.0′, index error 1.5′ off the arc, height of eye 2.5 m. What is Ho?”
• “Give me a practice noon sight, then check my answers.”
• “I'm at 36° N, 64° 48′ W on 20 March 2027. Which stars should I shoot at evening twilight?”
• “Explain LHA, and point me to the lesson.”