public EphemerisMetaData withEpoch(java.util.Date epoch) {
        setEpoch(epoch);
        return this;
    }
<p>
The epoch of a default, ephemeris from Space Track in UTC.
</p>
<p>
This field is not populated for customer-provided ephemerides.
</p>

@param epoch
       The epoch of a default, ephemeris from Space Track in UTC.</p>
       <p>
       This field is not populated for customer-provided ephemerides.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-groundstation/src/main/java/com/amazonaws/services/groundstation/model/EphemerisMetaData.java