Two distinct sets of transit events were detected: 1) a 152 + / - 4 ppm dimming lasting 1.811 + / - 0.024 hours
with ephemeris T [BJD] = 2454964.57375 + N... ▽ More NASA's Kepler Mission uses transit photometry to determine the frequency of earth - size planets in or near the habitable zone of Sun - like stars.
«A significant improvement in determining which Grand Minima are important for climate change came
with the work of Sharpe (2008) using Jet Propulsion Laboratory DE405
ephemeris data providing the results in Figs. 10 and 11.