@@GustavRex They do, but Grant very clearly says "Watching it through a telescope, night after night, ..."
@@Localnimation Hmmm... Terrence is talking about when the earth is on the opposite side of Jupiter. He even draws a diagram () to make the point.Okay, maybe he didn't mean it strictly, but, even if it was in that 5 o'clock configuration you described; as long as the sun's visible (i.e. it's not night time), I reckon the sun would be too bright for anyone to see Jupiter's much smaller moon, IO, with 17th century telescopes.
@@GustavRex If you watch the full video you will see that it is rather unclear about the role of Huyghens vs. Rømer (see e.g. ,
hour, on the hour. So at it turns light, at 2 it turns dark, so on. If you move a light-minute away, it now goes light at
and dark at
). That's what I reacted to. As far as I know the measurements as well as the conclusions were made by Rømer alone. Huyghens may have been involved in the aftermaths of this result.
@@GustavRex no it isn't. Holy jupiter, watch the video. At the text is on the screen saying "Huygens estimat"
