Loaded into permanent memory that is unaffected by power loss are every day of the year and associated with the date are 2 times per day. ex. Januray 5 2012 6:56PM 12:07AM
Still, you need a byte for hour and a byte for minute, so, a minimum of 2,928 bytes.
The times per day are for tides and can be predicted well into he future.
Seems like storing the variables would end up in the same place I am now. Having to store data.