What can a birth chart show without a birth time?
The chart is cast for noon. The planets are placed within a degree or so, which is enough for signs and most aspects, but the Ascendant, the Midheaven and the houses cannot be found, because the horizon turns through the whole zodiac in a day. The Moon moves about thirteen degrees a day and may be in either of two signs; the page says so when it is.
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 chart
What the picture is, and what the numbers on it are measuring.