Thanks so much for this video! I too like to put an emphasis on observational astronomy in my astronomy class. I'll definitely be using this video in my next term.
Great video! I have one small nit -- at 5:50 into the video, you said the Sun has an ALTITUDE of 189 degrees; I think you meant AZIMUTH. This might be confusing for people who are new to these concepts. Overall, though, kudos for a very clear description!
Thank you for this informative video. I was playing with stellarium and tracking the sun's Ra/dec. These appear to change each month. Is the Ra/dec fixed and unique for the stars, but changes for the sun/ planets.
I think this has to do with Earth's tilt and that the sun's position relative to the stars changes throughout the year. Since Ra/dec are measured from the equator, the tilt translates to changing Dec and the drift changes Ra
Thank you so much for the video! I love the way you constantly describe a flat plane while standing in front of a sphere that doesn't track into your explanations at all. Elevation angles require a flat baseline. Earth measured Flat. @NathanOakley1980 reviewed your video! Please check it out!
Still waiting for you mindless clowns to demonstrate a flat earth sight reduction using a flat earth nautical almanac, flat earth sight reduction tables and a flat earth coordinate system.
The earth and horizon being spherical and curved respectively does Not prevent you from having a flat base of a triangle to measure the altitude of a celestial object. You are not measuring left and right across the horizon. The flat base of the triangle you are measuring extends from your height of eye, directly out into space and just barely touching the horizon at one single point(and is perfectly flat). And directly below the celestial object. The other ray of the triangle extends from your height of eye directly at the center of the celestial object. And the angle of this triangle is the altitude of the object. No flat horizon or sphere is necessary.
@@lyingcat9022 "The earth and horizon being spherical and curved respectively" - That cannot happen. Curvature is a rate of change of slope. Horizontals have zero slope. The flat horizon is necessary, you even said so yourself.
@@DivergentDroid I said no such thing. The horizon does NOT need to be perfectly horizontal to take an accurate measurement of a celestial object’s altitude above said horizon. Why would it need to be flat? You are not measuring anything to do with the slope of the horizon or lack there of. The base or 0 degree line of your measurement is a perfectly straight line from your eye, directly out into space. And that line just barely sits at the point where sky meets earth and is directly below the object you are measuring. And it can and does happen, the horizon is curved, sloping down towards you Nadir in every direction. Because the earth is a spherical geoid.
@@lyingcat9022 You said it. I even used your exact quote! I'll quote it Again! "The earth and horizon being spherical and curved respectively" - If you understand what you read that means you are saying Both the Earth and the horizon is Curved! All I'm I'm telling you is the Horizon cannot be a physical curved sphere edge on a globe. The horizon Cannot curve because like curves, horizons don't have slopes! I didn't address your post further in my reply to you nor do I think I will now because I'm busy. It doesn't matter anyway because I already destroyed your sphere. You can Never have a horizontal on the surface of a sphere It's Impossible. We can establish horizontal at sea level on Earth which is a claimed 70 percent of the surface - ergo, Earth Cannot be a sphere with a radius 3959 miles! Nothing that is 70 percent of anything that is flat and always seeks it's own level as water does can Ever be spherical.
I don’t like this model and description of the celestial sphere being what looks like a personal small sphere. It’s misleading from what the mathematical or theoretical real life celestial sphere actually is. When it is in reality just one big sphere of INFINITE radius of which the center is technically the center of the earth. Though since the radius is infinite every observation point on the earth is functionally the “center” of the sphere… So funny enough the personal domes of infinite radius are functionally the same as just one central sphere of infinite radius. The measurements still works mathematically either model you use. I just think personal dome one could be confusing and misleading… and I mean more confusing than it already is haha.
