If you find those names, please post them here. I'm not the original topic starter, but I'm really interested in both linguistics and astronomy.

Here are a few:

Astronomer: Rinneolaidhe

Apex: Barr-uile

Polaris: An Réalt Budh Thuaidh, Réalt Eolais, Réilthín Eolais.

Aurora Borealis: Gealáin Tuaidh, Gealáin Oidhche, Gealáin Aeir.

Zodiac: Gréin-Fheireann, Gréin-bheach, Crios an mhearathail.

Elliptic Orbit: Cosán obhamail.

Venus: Plánaed bheandheas, Uenir, Bainrioghan na hoidhche, Caoimiar, Camhaoir, Bhenus, Réilthín an Lae.

Yellow Clouds: Truscan na spéire.

Jupiter: Iúpitear, Iupiter, Ioibh

Planet: Plánaed, Aire-Reann

Mars: Máirt, Caillthín na Mochóirí.

Constellation: Rind.

Comet: Réalt Mongach, Réilt(h)ín an Eiribill

Orbit (verb): Fithis

Milky Way: An Láir Bhán, Bóthar Bó Finne, Bóithrín na Bó Finne.

The Pleiades: An Treighdín.

The Plough: An Cam Céachta, An tSeisreach Cham, An Céachta, An Camchéachta, An tSeisreach.

Leomhaim: The constellation Leo.

Mercury: Mearbhlán.

Saturn: Sáturn.

Bootes: Boeit

The Little Bear: An tseachtaire bheag.

_________________
The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

An Lon Dubh, thank you so much, that's very interesting! If you have more info on that, please share. (If it won't take too much of your time, of course.)

Oh, holy wow!
I could have never found all this on my own! I am very much appreciative of all the help! All of this is greatly of interest to me. Thank you, all.

I apologise for not having responded sooner, I've been up at hospital staying with my Gran. But, not to worry, everyone is back home safe and fine now.

Again,