Observing Gegenschein

This "counterglow" phenomenon is related to the zodiacal light but appears on the ecliptic directly opposite the sun. It appears as a very faint elliptical patch of light. Observers who find themselves directly opposite some point along the path of totality might monitor the gegenschein for several nights on either side of the eclipse date and several times centered on the time of totality in their opposite hemisphere for any changes in its appearance.