SB 12.2.24
yada candras ca suryas ca
tatha tisya-brhaspati
eka-rasau samesyanti
bhavisyati tada krtam
Translation:
When the moon, the sun and Brhaspati are together in the constellation Karkata, and all three enter simultaneously into the lunar mansion Pusya — at that exact moment the age of Satya, or Krta, will begin.