Please provide more information about the comet you are interested in. There are many comets, each with its own orbit and appearance schedule.

To help me find the information you need, please tell me:

* The name of the comet: For example, Halley's Comet, Hale-Bopp, or Neowise.

* If you are looking for a specific appearance: For example, the last time it was visible, or when it will appear next.

Once I have this information, I can tell you the years the comet has appeared or will appear.