astronomiya

/astronomija/

Cases

FormWhen to use it
nominativeastronomiyathe astronomythe plain dictionary form — the doer of the sentence
genitiveastronomiyanıthe astronomy'sthe owner — whose it is
accusativeastronomiyanıthe astronomy (as the object)a specific, known object — whom or what
dativeastronomiyağato the astronomydirection or recipient — to where, to whom
locativeastronomiyadaat / in the astronomywhere it is; also having — mende bar, "I have it"
ablativeastronomiyadanfrom the astronomywhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

Owned
myastronomiyammy astronomy
yourastronomiyangyour astronomy
his / herastronomiyasıhis / her astronomy
ourastronomiyabızour astronomy
you all'sastronomiyağızyou all's astronomy
theirastronomiyalarıtheir astronomy

There is no plural of this word. The ending would attach like any other — it is the word, not the grammar, that refuses: this is not something Karachay counts.