The set of six pictures does not show the entire period of the Cepheld, Du shows the star getting dimmer and then brighter until reaching its maximu brightness. Cepheid variables tend to brighten fast, followed by a more g decline in brightness. Usually, they will take one-third of the period to bri and 2/3rds of the period to dim again. Look carefully at the six images an dates. On which date was the Cepheid star the dimmest