If you wished to observe a star with a right ascension of 12^h what would be the best time of ye

If you wished to observe a star with a right ascension of...

Key Concepts

Meridian Transit

A star is best observed when it is crossing the observer's meridian because it reaches its highest point in the sky at that time. At meridian transit, atmospheric interference is minimized, which is ideal for taking observations.

Seasonal Variation of the Sun's Position

Due to Earth's orbit around the Sun, the Sun's right ascension changes throughout the year. This variation means that different stars, with their fixed right ascensions, will be optimally visible (i.e., transiting at midnight) at different times of the year depending on the offset between the star's right ascension and the Sun’s.

Right Ascension

Right Ascension is one of the two fundamental coordinates in the celestial coordinate system, analogous to longitude on Earth. It is measured in hours, minutes, and seconds, allowing astronomers to specify the position of stars and other celestial objects along the celestial equator.

Local Sidereal Time

Local Sidereal Time is a timekeeping system that reflects the rotation of the Earth relative to the fixed stars rather than the Sun. It determines which right ascension is currently crossing the local meridian, making it crucial for planning astronomical observations.

Transcript

00:01 Hi, everybody.

00:01 So we want to know, will we see the top of a rainbow below the horizon? in what direction would you see the rainbow? and we know that rainbows are made from water droplets and that the water inserts here.

00:18 And it has a total reflection and fraction in here.

00:23 So it's going to come out and we can follow that a little bit better for the refractive inducts here.

00:29 There we go and that's the refractive index and then we have the total internal reflection which is just going to be like this okay and just drawing this very simple for you guys so the different colors of light bent through different angles after total internal reflection in the back inner sources of the drop different colors the light are again reflect refractive here retracted from the back inner surface of drop, and they leave the front of the surface.

01:19 So in this case, the shorter, the wave length is the first one you're going to see.

01:26 So violet is going to be the first one you're going to see.

01:32 Violet's wave length is the first one you're going to see because it's bent the most.

01:36 So it reaches your eyes faster.

01:39 And then after violet is blue, then we have green.

01:47 Then yellow, then red.

01:54 So the first color you're going to see is this one, second one, third one, fourth one, and fifth one.

02:05 And that's why when you look at the wavelength spectrum, it's also based on the wavelength and the refractive index, okay? and the colors in the light are seen in the angle.

02:18 The result is at the top of the rainbow is red.

02:21 So you'll see the red because that's the fifth color you're going to see last.

02:27 So the top of the rainbow is going to be red.

02:31 So if it's raining in the morning, we can observe the top of the rainbow, which is set below the horizon.

02:38 So we can have, we can say that this is below the horizon.

02:47 Okay.

02:49 And as the sun rises from the east, the rainbow is towards the west.

02:56 Because your rainbow, your white light source, you're going to see the rainbow opposite of the white light source.

03:03 So you're going to, so you will see a rainbow opposite of its white light source...

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