Stellar-cycle

A stellar cycle is a Transformer unit of time.

Stellar-cycles have two similar-but-not-irreconcileable usages.

• In Beast Machines, stellar-cycle refers to a year-period, or the amount of time it takes for Cybertron to complete a circle around its star.
• Beginning from 2005 IDW standardized many Transformer time-measurements. In their parlance, a Stellar-cycle is ~7.5 months.

It's possible that these are two different measurements of time, or the IDW stellar cycle measurement can be retroactively applied to other continuities.

From Teletraan I: The Transformers Wiki, a Wikia wiki.