The essential elements of the scientific method are traditionally described as follows:
Observe: Observe or read about a phenomenon.
Hypothesize: Wonder about your observations, and invent a hypothesis, a 'guess', which could explain the phenomenon or set of facts that you have observed.
Test
Predict: Use the logical consequences of your hypothesis to predict observations of new phenomena or results of new measurements.
The scientific method usually refers to either a series or a collection of processes that are considered characteristic of scientific investigation and of the acquisition of new scientific knowledge.
Precession of the perihelion 
