A Mage may attempt to predict the modifier for a given day. Use of the Time Sphere can lower this difficulty as per BoS p112. Normally, a mage only tries to predict for one Sphere at a time, so increase the difficulty by one for each additional sphere. Each attempt takes one hour for consulting star charts or making observations, making calculations, etc. Three or more sucesses will give the mage the exact number.
Failure gives no information.
Botching gives incorrect information. Making a prediction for the same day takes 30 minutes and is difficulty 6. Predictions for far in the future should take longer and be more difficult - GM discretion. Sympathies Hermetic Mages are very big on sympathetic magick. They will often go so far as to wear clothing, eat foods, wear jewelry, take actions, etc.