In addition to Matt's excellent observations regarding Comet 17P/Holmes, I discovered that this comet's period is 6.9 years.(The "period" of a comet is the time required for the comet to go once around its orbit and return to the same spot.) When converted into days (6.9 years x 365.2422 days in a year), I was amazed to see that the period is 2520 days or exactly 7 Biblical prophetic years!

Kevin