If you click on the graph area, the day and apparent magnitude value for that location are displayed at the top.

• Press N to get data for a new star.
• Press C to connect the dots.
• Press left arrow key to shift the curves to the left (shows more phases).
• Press right arrow key to shift the curves to the right (shows fewer phases).
• Press G to display a grid over the data points.

The light variation of a Cepheid is shown over the course of many days. The irregularities in the light variation are due to observational errors.

Below is a diagram showing a typical light curve, with the time span for a pulsation period shown and an estimate for the average magnitude.