Stellar-cycle

A stellar cycle is a Transformer unit of time.

Stellar-cycles has two at-first-glance-apparently-different-but-not-irreconcileable usages.

• In Beast Machines, stellar-cycle refers to a Cybertronian 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 Earth months.

It's possible that these are two different measurements of time, or perhaps the IDW stellar cycle measurement can be retroactively applied to other continuities. (If so, it would give us our first real astronomical data on Cybertron's orbit in any continuity).

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