Astronomy - Ch. 4: History of Astronomy (1 of 16) Key Astronomical Events

In this video I will introduce chapter 4; the history of ancient to Renaissance to modern astronomy.

Next video in this series can be seen at:

[puriap]

These lectures have no animations or special effects but they are just so fun to watch, so easy to understand and addictive. Thank you.

[sameersangwan]

Hey, i was wondering of space time graph where space and time are represented in coordinate geometry. so my observation is that we could go straight way at +time axis with 0 space displacement but we cant' go straight way space axis without any time which means we cant stop time but if get a curve with asymptote at space axis we could get time to halt but as we all know its impossible or i could say tending to light is impossible So lets get into back in time in 2nd quadrant where the time is negative which is impossible to achieve for any scientific means unlike in 1st quad where we could scientifically achieve it so leave it and get into 3rd quad and lets leave this because thinking of it is a shit.Now for 4th quadrant it somewhat how its possible because i think we could get space -ve (thinking it at first i was considering myself an ass) but i was wondering if we could get into the -ve side of space time blanket somehow and get the space as negative so we could go backward in time with our +time axis but -ve space axis we could travel world backward with being time as positive. So can you please consider my idea and respond to it (can also tell me if its a shit).
Thankyou

[brentbennight]

If the summer and winter solstice is due to the tilt of the earth and those two events will be 180 deg opposite each other across the ecliptic plane, how come high noon (sun is at it's highest point in the sky) in summer and high noon in winter don't shift by 12 hrs?

[rentacowisgoogle]

This is perfect! Exactly what i was looking for! Thank you so much.

[jakubkusmierczak]

Very good examplification👍 genius graphic!

[vgovind]

Sir I have a question...as the earth is in an elliptical orbit round the sun, at which focus of the ellipse is the sun currently at?

[jesus]

In the heliocentric theory, the universe and all the objects are floating, revolving and spinning in its same places in total and perfect inmutable equilibrium...they never change and never get affected by other objects, not even by the imaginary gravitational forces of larger complete systems, miraculously nothing affects the heliocentric theory, and nothing affects the "tiny earth's fixed point " .

Heliocentrism should be called the theory of a frozen existance that moves but doesn't change...

Geocentrism (if you study it seriously) on the contrary is way more logic and fits perfectly in our existance and it fits exactly with the changes we perceive in the planet, including the south pole low temperature.

[jesus]

Why is the North Pole warmer been not tilted further from the sun than the south pole during a complete earth revolution ?

[harshannn]

Sir in my life once I will meet you for a unspeakable doubt iam from India and I will come to las Vegas and I will meet you sir 😊🙂