simonshack wrote:Basically, what you are saying is this:
- If an earthly observer watches the Sun and Mars in June (with Earth tilted by +23,5° towards the Sun) as they are straight ahead of the observer - he will see them both at the same elevation.
- When this earthly observer watches the Sun and Mars in December, (with Earth tilted -23,5° away from the Sun) and Mars and the Sun are separated laterally by 5 hours of Right Ascension, Mars will appear to the earthly observer to be 16° higher in the sky than the Sun.
Sorry - but this doesn't work out for me. Try to imagine watching two airplanes flying (at the same altitude) at the very far edges, East and West of your horizon. Now, imagine that Earth suddenly tilts downward by "X" degrees. Would this make one of the two planes appear to fly at higher altitude than the other? It doesn't matter in which position Mars is in its orbit: its orbit is always supposed to be, in the Copernican model, almost level (+/1,85°) with the Sun, at all times. Yet, this is evidently not the case.
simonshack wrote:It doesn't matter in which position Mars is in its orbit: its orbit is always supposed to be, in the Copernican model, almost level (+/1,85°) with the Sun, at all times.
North Star Closer to Earth Than Thought
"The North Star has been a guiding light for countless generations of navigators. But a new study reveals that its distance to Earth may have been grossly overestimated."
"In fact, the North Star—also called Polaris—is 30 percent closer to our solar system than previously thought, at about 323 light-years away, according to an international team who studied the star's light output."
"Using Russia's 6-Meter Telescope, the researchers were able to calculate the North Star's distance from our solar system by analyzing its spectrum of light and obtaining data on its temperature and changes in intrinsic brightness over time."
"That significantly revises the previously accepted value of 434 light-years, which was obtained by the European star-mapping satellite Hipparcos in the 1990s."
"The new discovery of a closer North Star is "most unexpected for what is considered to be one of the Hipparcos satellite's most solid results," said study leader David Turner, an astronomer at Saint Mary's University in Halifax, Nova Scotia."
"Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars.
The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.
The word "Hipparcos" is an acronym for High precision parallax collecting satellite..." [bla---bla---bla]
The parallax method is the fundamental calibration step for distance determination in astrophysics; however, the accuracy of ground-based telescope measurements of parallax angle is limited to about 0.01 arcsecond, and thus to stars no more than 100 pc distant. This is because the Earth’s atmosphere limits the sharpness of a star's image. Space-based telescopes are not limited by this effect and can accurately measure distances to objects beyond the limit of ground-based observations. Between 1989 and 1993, the Hipparcos satellite, launched by the European Space Agency (ESA), measured parallaxes for about 100000 stars with an astrometric precision of about 0.97 milliarcsecond, and obtained accurate measurements for stellar distances of stars up to 1000 pc away.
brianv wrote:"Copyright" image so I'd better just post a link.
http://www.esa.int/var/esa/storage/imag ... mage_2.jpg
http://fotoforensics.com/analysis.php?i ... aca1.79641
DrTim wrote:There are plenty of anomalies in the Standard Model of gravity, the Solar System, the Universe, but whether the Earth orbits the Sun is not one of them.
DrTim wrote:But let's take care. The Brahe system was favoured by the Church, the biggest and most damaging hoaxter in history, whose success had been "all witchcraft". No-one frightened the populace more than the Church. So even the ideas that should be most comforting to the human spirit, such as the Brahe system, can and do get used by the worst elements.
Secondly, the plausibility, balance of probabillities. So here we have Earth, nicely sunbathing by the Sun in a little orbit all of its own, while the rest of the universe is made of one-thing-orbiting-another, and there is nothing like the Earth out there... Doesn't seem likely.
DrTim wrote:WOW, clowns everywhere! I knew I would catch them eventually, and now I have.
Someone has edited my post above and I have a screenshot to prove it. In several places my mis-spelt "Brache" was changed to "Brahe", but one was missed. Who's the clever Alec?
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