Hello, I'm Doug. This is a measurement 101 page cast. Three minutes talking about a particular web page on this site. In this case, I'm talking about the measuring while up or down or equivalently the Quaternian Gravity page. So there are these two supernova and the reference observer, that's me, goes and says, measures the time and says the time between those two events is five. And the distance between the two is three. So we do the square to find that the interval is 16 and the space times time is 30. And that's our starting point. Hello, I'm Quaternian Gravity Doug in yellow. Everything Kelly Green on this page is about Quaternian Gravity. So it says a Quaternian squared equals the interval and space times time. And invariant space times time is Quaternian Gravity. But what does that mean? Well, let's focus on that girl floating up above there with those balloons. She's not slowed down by gravity. So her clock is going to tick a little faster. And if she measures the time between those two events with our faster clock, it's going to end up with a larger number. On the other hand, that ruler, she's using, expands in space and gets larger. And so if she uses that to measure the distance between those two events, it will end up with a smaller number. When the number is getting larger, the other is getting smaller. Now, changes are very precise. In the standard approach to gravity, known as Einstein's general relativity, the bigger DT almost cancels out the smaller DR. But not exactly. In my Quaternian Gravity proposal, in fact, it's all about the larger DT exactly canceling out the smaller space DR. And the result is an invariant space time's time of 30 for the person floating above the clouds exactly equal to what the reference observer got. But what about the interval? Well, that's made up of a larger number minus a smaller number. So minus times of minus is OK. So the result is an interval that is actually larger than the reference observer. But what about that guy lying down, pointing up at the two supernova? Well, he feels the weight of gravity. And so that means his clock is going to tick a little slower. And with that slow clock, he's going to think the time between the two explosions is less. His meter stick is also a little smaller. OK. So his spatial measurement is going to say, hey, that distance is actually a little larger. OK. But in the Quaternian Gravity proposal, those exactly cancels out. And so the result is an invariant space time's time of 30. Exactly equal to what the reference observer gets. And exactly equal to the balloon girl floating up above there is. But what about his interval? OK. His interval is made up of a positive number that's smaller, minus a bigger negative number. And that means that the interval is in fact smaller than the reference interval. And of course, smaller than that girl floating above. And that's it for this page cast. Thank you.