Series of lights 50+ viewed on same trajectory,

A constant line of star like forms, moving on a single trajectory slowly along Marin headlands west to east at first in front of us. A few minutes elapsed then they returned flying from the same direction but more north westerly to the south easterly direction and this time more overhead. The lights were spaced at different intervals, some seemed to be catching up and varying ever so slightly in speed, some were flying closer together, some more spaced out.