Astrologers claim to be of the most ancient groups in the field of magic, with some going as far as to claim that the first ever spell was transcribed by an Astrologer, though many dispute this. Nonetheless, the Astrologers go about wizardry with more zeal than any other school, most devoting their lives to it's study, often from a very young age. Most Astrologers simply fade away, transcribing a variant of a spell, or if they're lucky, a new spell entirely.

Reader of Astral Winds

The Astrologers look to the stars for their spells, letting the flow of the cosmos decide their magical knowledge.
Once per long rest, you may attempt to read the flow the Astral Winds, if you do so, select 6 spells of either your highest level spell slot available or lower, then order them in a table numbering 1-6. Then, roll a d6, according to the roll, transcribe the spell as it relates to the table created earlier.

Eldritch Understanding

As you grow more experienced, you gain a greater understanding of Stellar Wind and the flow of natural Magic, with this, your sessions of reading the stars are enhanced, either through learning more magic, or learning more about a single spell. 
When you attempt to Read the Astral Winds, you may roll 2d6 instead of one, based on the roll you may either transcribe that additional spell, or, if you roll the same spell twice, you may choose to enhance that spell, for the rest of the campaign, whenever you attempt to cast that spell, it is cast as 1 level higher than the cast level, at no additional cost.

Gift from Beyond

During your first Long Rest after reaching 10th level, a small shard of starlight falls from the sky nearby, this shard can be collected and turned into an Item, either an Astral Blade, a spellcasting focus doubling as a powerful sword, an Astral Focus, an incomparable spellcasting focus that enhances a chosen school of magic, or an Astral Heart, a pendant that grants extra spell slots. 

True Understanding

Upon reaching the 14th level, your eyes fill with blinding starlight, you gain true sight, from then on, your eyes appear like a gateway to the night sky. 
In addition, whenever you learn a spell via Reading the Astral Winds, you may re-interpret the true nature of the spell, if you do this, you may permanently alter either the casting time, damage type, save, or up to 3 components of that spell, these changes cannot be reverted.