It depends on what you're expecting out of it. On a given date agenda, pressing M will show you all the relevant info about moon ephemerides.

If you want it inside your, say, daily agenda you'll have to add them as sexps in any of your agenda files.

* Moon phases
%%(my-moon-phases-function)

Where my-moon-phases-function returns a string with the phase for a given day getting the info from lunar.el

There is a detailed howto in the org hacks page, here. A sunrise/sunset snippet is also shown in that page.

It doesn't tell how to show eclipses, but if you know how to find such info, it'll be easily adaptable as well using these clues.

It depends on what you're expecting out of it. On a given date agenda, pressing M will show you all the relevant info about moon ephemerides.

If you want it inside your, say, daily agenda you'll have to add them as sexps in any of your agenda files. Note that there shouldn't be any subtree indentation before %%

* Moon phases
%%(my-moon-phases-function)

Where my-moon-phases-function returns a string with the phase for a given day getting the info from lunar.el

There is a detailed howto in the org hacks page, here. A sunrise/sunset snippet is also shown in that page.

It doesn't tell how to show eclipses, but if you know how to find such info, it'll be easily adaptable using these clues as well.