What does a void of course Moon mean?
The stretch after the Moon makes its last exact aspect to a planet in its current sign and before it enters the next. The Moon is still moving; it just has nothing left to do in that sign. The tradition says what is begun then comes to nothing, which is why the When page steers around it for beginnings, and why it does not mind it for meditation.
Where astrologers disagree
Which planets count is disputed. The classical rule uses the seven visible bodies; many modern astrologers add Uranus, Neptune and Pluto, which makes the void shorter and rarer. Both are printed where they differ.
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.