Planetarium is in weekly instalments starting from when you register. If you register now you can submit solutions to the puzzles in part i but you won’t be granted access to part ii until next week.
If you’ve already got a reader-name for Planetarium, you should log in here instead.
Give yourself a reader-name, so that Planetarium can identify you when you visit.
Choose a password that is not easy to guess, but that you won’t forget (the password is case sensitive). Keep your password secret. We do not re-issue forgotten passwords — if you forget yours, you’ll have to go right back to the start.
Planetarium uses a cookie to identify you when you’re logged in.
Planetarium can automatically remind you by email if you forget to log in for over a week, so you don’t miss any instalments. We don’t mind if you leave your email address blank, but of course if you do that you won’t be sent a reminder — but then, there are two other ways you can be reminded when instalments are due. When you stop reading Planetarium, your email address is deleted along with your reader-name. See the FAQ about email to be reassured.
After you’ve registered, if you let a few weeks elapse without logging in, your reader-name will expire. Just make sure you visit every week, and you won’t have to worry about this. You will be granted access to a new instalment of Planetarium every seven days, starting from registration (give or take a few hours).
There is a lot more information in the extensive Planetarium Frequently Asked Questions.