I hope I can explain this fairly well :)


I will have a table containing fields as follows

Field1 Field2
[Type of event] [dateTime event occured]

Fields 1 and 2 will be entered by the user.
Then fields 3-13 will be filled with times of astromical events for the date entered on field2 such as sunrise and moonrise etc.

For example a user enters a time of 1000 am and moonrise is at 0800 am and sunrise is at 0600 am for day 1 then
on day 6 user enters time of 1400pm and moonrise is at 1900 pm and sunrise is at 0700 am for day 6

What I would want to be able to do is given any day predict when the users event should happen based on the astronomical calulations for that day.

Ideally a graph corresponding to the days astonomical event with peaks and valleys arround those events..