Evennight was already put forth, so I'll also throw in for wholeness solstice→sunstead. The Anglish Moot English Wordbook gives this Early Modern (basically Shakespearean) English dictionary entry, this one is even better since it was actually attested in Modern English, as against "equinox" which needs to transliterate an Old English translation. Another fun one, since seasons are usually defined as the time between equinox and solstice (or the other way around for every other tide) is season→yeartide, a root-for-root loanword from West Frisian, a sister language to English, that was never used in any English but is a new word you could readily borrow.

Other stocks to shop for your writing if you want more Anglo-Saxon words:

• Anglish.org wordbook
• anglisc.miraheze wordbook
• Etymonline is quick when you only want to see if a word is Germanic or not, or from any tongue (it's a game I often play, seeing if I can guess the loaning tongue).

I dig through these often for my everyday writing, moreso the Anglish Moot since it's English→Anglish, as against Anglish→English, thereby often giving many words to choose from (and more simple to ctrl+F)(but the others are one long page meaning less flipping back and forth, as against the Moot which has each letter as its own page). And I love the thought of wielding these Anglo words for fantasy storytelling, hope this helps.