When an ephemeris is being sought, it is desirable to have a time of maximum and/or minimum brightness determined. At present the "epoch" used in a phase plot appears to be based on the mid-time of the set of observations. Certainly, the epoch reported in an ephemeris is usually the maximum or minimum closest to the mid-time of the observation set. If a Fourier model is produced, it should be possible to find the epoch of minimum or maximum from that and report it as the epoch.
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