Space Meowgic!!!
Harness the Power of the Cosmos Without All That Astrology Nonsense
SPACE!!! 
Who doesn't like space? Everyone likes space! People who are into meowgic also especially like space, except that astrology is really what they mean with "space", and I can't have any of that. I mean, how could I? I have a masters in astrophysics and a PhD in space science,there's no way I can suspend my disbelief that much.
If you think about it, astrology really hinges on an universe where the Earth is at the centre and everything rotates around it: not just because that was the view of the universe back when astrology was invented, but also because why on Earth (heh) would the planets have an influence on Earth, if Earth is just one of them, just like them? And what to say about the other stars, shining so far away that their light takes years, centuries, millennia even, to get to our eyes? It follows that most of them don't even "know" about them, because we live our whole lives in a fraction of the time it takes for the news of our births to reach the starts. And would the same stars also influence other planets, inhabited by other thinking, bull💩-loving beings? What of the fact that constellations would look different when seen from alien skies?
Speaking of constellations... they actually don't exist. It's just an effect of perspective that makes the stars in a constellation look related to each other, but they are not1 and may very well be thousands of light years apart. Moreover, you probably already know that there are 13 constellations that the Sun can cross, that the sign do not exactly correspond with the constellations and that a phenomenon known as precession of the equinoxes means that signs and constellations are also out of sync.
So, are we just supposed to give up the stars, probably the most meowgic thing we have? Well, I'm definitely not going to, and so I took my astrophysicist's hat back out from the drawer and devised a way to use the meowgic of the cosmos without throwing common sense down the drain.
Let's get back to the basics. The point of waiting for a particular astrological moment to cast your spell is that the celestial objects that are in the sky in that moment supposedly add their own influence to the spell. That's fine: planets and stars have always been part of hooman mythology, and that's why they carry a meaning that can be harnessed for our spells. But that's also means that we are not limited to the solar system's planets and the zodiac, nor are we limited to the objects that were known in antiquity, or even those that they are visible to the naked eye! As long as it means something, we can use it.
So here is how I do it in practice. Once I have chosen a celestial object that fits my goals, I have to wait for the "right" moment. This might mean when the object is at the zenith, when it crosses the horizon, when it gets near the Mon or the Sun, when it's visible from a certain window in my house... even when it's at the nadir, if I want to use the absence of the concept it represents, but that's probably a bit too convoluted. How do I know that? Well, Wikipedia is a good start. It tells you which part of the sky the object is in, during which season it is visible and has a picture for reference. You can also use apps like Telescopius or Stellarium to help you find you target in the night sky. It's fine to use technology!
But what if it's cloudy? Well, I'll tell you a secret: I live in an extremely rainy part of the world, and almost never enjoy a clear starry sky 
. It's a great loss for my soul, but it doesn't matter so much for my meowgic: high above the cloudy sky, the stars are still there, still shining. If a screen of water droplets was enough to stop their energies, it wouldn't be worth including them, after all. So then, it's really that simple. Now you have a template, and I will finish with a short list of celestial objects that you can use. Just remember that many many more are out there, and if you come across an interesting one you are free to make it a part of your meowgic!
Sirius: we are starting with a classic. For the ancient Egyptians, Sirius, known as Sopdet, heralded the flooding of the Nile and the start of the agricultural year. For the Romans, it brought madness in people and especially dogs, because it rose during the hottest days of northern summer. Pick your side, or just go with the dog association, which is shared by other cultures as well.
Polaris: known as the Northern Star in the northern hemisphere, because it happens to coincide with the direction of geographic north. For this reason, it is good for spells that are about finding your bearings or finding a goal for yourself. If you are in the southern hemisphere, the official alternative is the Southern Cross. However, finding the geographic south from it is not as straightforward as with Polaris, so another option is Sextans, which is actually visible from most of the inhabited world. It's named after a navigation tool, so it fits pretty well.
Spica: this star's name is the Latin word for "ear of wheat", so it's perfect for any spell relating to fertility, abundance and growth.
Algol this is a very bright star that occasionally dims for a couple of days. This is due to the fact that it is actually a system of at least three stars of different size and luminosity which eclipse each other every now and then. For the ancients, however, this meant that of course the star was a demon, and for us this makes it perfect for a good ol' hex. 
Well, here you have it! That's enough for a start, but I'll probably come back with more interesting space facts at some point. Stay tuned, and in the meantime, go do some meowgic!
With the exception of the Pleiades, but you can read about it yourself.↩