>
>   > Since I am so good at maths, I have calculated that sometimes this
> year,
>   > it's Emacs' 40th birthday! Can we make it even more specific with a
> date,
>   > perhaps, so that those of us that wants to can celebrate with some
> cake? :)
>
> I don't have any records of when the first Emacs was usable for editing.
> It would have been some time in late 1976, I think.
>
> But it may not have been an identifiable moment, anyway.  I probably
> started editing with Emacs when it was not really ready to ask anyone
> else to use.
>
> One option is to imitate Christian practice by fictionally attributing
> to this event a date that is celebrated for some other reason.  Thus,
> we could celebrate Emacs's birth on Grav-Mass day, December 25.
> (See stallman.org/grav-mass.html.)
>

That, or December 10 (Nobel prize ceremony day)...