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here's how to find where north is on a clear night (and your gps dies) if you live in the northern hemisphere ... polaris ...here's how to find where north is on a clear night (and your gps dies) if you live in the northern hemisphere. unfortunately, there's no corresponding bright star for south in the southern hemisphere.
also, i realize the big and little dippers are asterisms and not constellations, but it's very difficult for most people to see ursa major and ursa minor (the big and little bears).(more)(less)
??????????????????? 2) ?????????? Space coordinate ??????? - 1. ?????????????????????????????????????????????? ??????? ...??????????????????? 2) ?????????? Space coordinate
??????? - 1. ?????????????????????????????????????????????? ?????????????????????????????????????????????????????? (????????????????????) ???????? ?????????????
Earth rotation seem stars rise and fall. So we coordinately remark stars by celestial grid sphere as same as earth sphere, meridian and latitude.
2. ?????????? ??????????????????????????????????? (0 - 360 ????)
Azimuth, the degree of direction, between 0 - 360 degree from north (to south and return) to north.
3. ?????? ??????????????????????????????? (0 - 90 ????)
4. ?????????????????????????????????????????
about polaris at present and future ..
5. ???????????????????? (?????????) ???????????????????????????????????????????????????
All stars rise and fall parallel celestial latitude.
???????: ???????????????????????
??????: ????? ????????
????: wisdommedias(more)(less)
Ekvatordaki bir gözlemciye göre güney ufku yönündeki takimyildizlarin bir gün içindeki hareketi... "Motions of ... Gök ...Ekvatordaki bir gözlemciye göre güney ufku yönündeki takimyildizlarin bir gün içindeki hareketi...
"Motions of constellations in southern horizon according to observer on equator at day"..(more)(less)
I explain how to polar align an equatorial mount using the star drift method. This is the spoken text: This video ...I explain how to polar align an equatorial mount using the star drift method. This is the spoken text:
This video illustrates the principle of the star drift method for polar alignment of an equatorial mount. A rough alignment is first performed by pointing the RA axis of the mount towards Polaris.
The up-and-down tilt of the RA axis is called the altitude adjustment and the left-right adjustment [is called] the azimuth adjustment.
We will illustrate here the azimuth adjustment for the northern hemisphere.
This black line on the skyboard stands for the actual path of a star during the night. We choose a star that is close to the southern meridian and near the celestial
equator. It will rise in the southeast and set in the southwest.
I drew the black line by pointing my meccano mount straight towards the skyboard and turning the torch around the RA axis. This is the star going across the sky
and the bright disk of light represents the view I would have in my telescope, perfectly aligned so the star stays centred.
I will now turn the mount counterclockwise in azimuth a bit and see how it tracks my artificial star. The dots follow the track my, now misaligned, mount makes in the sky. Notice that the star appears to rise relative to the track the mount makes.
So if the star appears to rise, it means we need to turn the mount in azimuth a bit clockwise. If it appears to fall, we need to turn the mount counterclockwise. Hopefully, this process will terminate(!) and we have a good alignment.
So, what about the altitude adjustment? For the altitude adjustment we pick a star in the east. Here I've drawn again a star rising in the east, by just turning the mount in the RA axis. So what would happen if my altitude was a bit lower, say, I was tracking there? Well, the star would appear to rise faster than my mount. So if the star rises I just have to turn my mount a bit up and if it's falling I have to turn my mount a bit down.(more)(less)
clip 2 from The Sky at Night looking back at the 50 years of broadcast since 1957. In this clip, Patrick Moore talks to ...clip 2 from The Sky at Night looking back at the 50 years of broadcast since 1957. In this clip, Patrick Moore talks to prof. Carlos Frenk about the 'seven wonders of the universe' discovered in the last 50 years.(more)(less)
There was a time when science seemed to be the enemy of religious belief -- that time is no more! Modern physics and ...There was a time when science seemed to be the enemy of religious belief -- that time is no more! Modern physics and cosmology (science of the origin and development of the universe) now provide firm objective evidence of the existence of God, confirm the primary attributes of God, and show how God created the physical existence out of 'nothingness'. This knowledge comes from a critical analysis of the 'Big Bang' theory, Einstein's Special Theory of Relativity, and work being done in quantum physics. The concepts behind this esoteric scientific knowledge can now be presented in such a way as to be understood by any person with a modern education.(more)(less)
An equinox in astronomy is the event when the Sun can be observed to be directly above the Earth's equator, occurring ...An equinox in astronomy is the event when the Sun can be observed to be directly above the Earth's equator, occurring around March 20 and September 23 each year. More technically, the equinox happens when the Sun is at one of two opposite points on the celestial sphere where the celestial equator and ecliptic intersect. In a wider sense, the equinoxes are the two days each year when the center of the Sun spends an equal amount of time above and below the horizon at every location on Earth. The word equinox derives from the Latin words aequus (equal) and nox (night).(more)(less)
