We will also need the RA in degrees, not hours. A cheap basic scientific calculator is all that is needed for these calculations - although a programmable calculator can cut the work down if you want to calculate a whole series of positions. A spreadsheet allows you to prepare a list of positions of the object for each hour throughout the day. This means that the formulas can be copied straight into a spreadsheet, and the names changed to cell references. Scientific calculators have been programmed with the rules of precedence.
Scientific calculators have brackets buttons.
For most modern astronomical purposes, the reference date is J2000, which corresponds to 1200 hrs UT on Jan 1st 2000 AD, and you can use the table below to find how many days have gone by since J2000 for any date for the next 20 years or so. The tables below can be used to calculate the number of days and the fraction of a day since the epoch J2000. If you need the number of Julian centuaries, then just divide the 'day number' by 36525. Keep the negative sign in any calculations. Suppose you have a sunny morning.