The answer I gave and the one given as solution are identical yet it shows my answer as incorrect with the Dydd Sadwm scored through.
That's because you spelt it with an M instead of RN - it's Dydd SadwRN. Often difficult to see the difference on a small screen!
Thanks Malwen, I did work it out after I'd made the post, but diolch for bothering to reply.
Mnemonic: "day of Saturn" (the Roman god that also gave his name to the planet).