This project shows the meaning of the star within the crescent on Roman coins is likely symbolic for a solar eclipse. The star is a planet to the ancients and the crescent is the sun. The ram is an astrologic symbol for ancient Judea or the lands from Antioch to Egypt.

Please see the below link to, " The Evidence for Aries the Ram as the Astrological Sign of Judea, " by Michael R. Molnar

Clearly one sees a planetary body moving over the sun in this photo. This is the Antioch ram coin issued from Nero in 55-56 AD. From the T. Cartwright collection

Eclipse diagrams are taken from the NASA Website, "Canon of Solar Eclipses"

Acknowlegements, Eclipse Predictions by Fred Espenak, NASA/GSFC

Thanks to the Vcoins search engine website and the individual vendors for the photos as cited

2000 years ago the cross was a Roman symbol of death and terror. Jesus Christ transformed this symbol into a universal sign of God's love, hope and resurrection. Solar eclipse events are recorded in Roman mythology during the conception of Romulus and Remus by the war god Mars and during the foundation of the city of Rome. The solar eclipse to the Romans was a sign from their gods that war was upon the Earth. The solar eclipse symbol of the star/pellet within the crescent on Roman coins and legionary standards was also a sign of their god's approval of Roman domination over conquered lands. Fifteen hundred years later, the "Our Lady of Guadalupe" Icon was presented to the New World as an inverted Roman Legionary Standard. Jesus Christ changed these symbols of Roman domination and slavery into an everlasting sign of God's love and compassion.