What is a lunation?
A New or Full Moon. Each one falls in a particular sign and, in your chart, a particular house, so the same New Moon starts something different for each person. The New Moon is read as a beginning and the Full Moon as a culmination or a seeing clearly.
Where you see this in OrbHeaven
Your own chart is calculated from your birth details, and this definition is written out again there with your numbers in it rather than in the abstract. The chart, the glossary and thirty days of dated timeline are free, and nothing here is charged per question.
About a minute. Birth time optional, and no account until after you have seen it.
The sky moving
Everything that happens after you are born, which is where dates come from.