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2 dni temu · Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.
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Observation Log Book. Every amateur astronomer will tell...
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Stellarium Web is a planetarium running in your web browser....
- My Observations
2 dni temu · On this modern system, the faintest stars visible to the unaided eye are still around magnitude 6, but the very brightest stars actually have a magnitude that is negative. Sirius (the brightest star in our night sky) has a magnitude of -1.46. The sun has a magnitude of -26.74.
5 dni temu · This formula accounts for the difference in longitude, latitude, and elevation between two points on the Earth’s surface to provide an accurate distance measurement. To measure distance in Google Earth, simply search for a place or select a location on the globe.
2 dni temu · The dimensionless Hubble constant is often used when giving distances that are calculated from redshift z using the formula d ≈ c H0 × z. Since H0 is not precisely known, the distance is expressed as: In other words, one calculates 2998 × z and one gives the units as Mpc h-1 or h-1 Mpc.
4 dni temu · wells = np.stack([x_well, y_well]).T. We can create a KDTree: interpolator = spatial.KDTree(wells) And query efficiently the tree to get distances and also indices of which point it is closer: distances, indices = interpolator.query(points) # 7.12 ms ± 711 µs per loop (mean ± std. dev. of 30 runs, 100 loops each) Plotting the result leads to:
5 dni temu · A map scale is a ratio that shows the relationship between distances on a map and the corresponding distances on the ground. In the case of a map scale of 1:50,000, it means that one centimeter on the map represents 50,000 centimeters on the ground.
3 dni temu · Positive velocities mean the star is moving away from Earth, and negative velocities mean the star is moving toward Earth. (You can assume that the orbit is viewed edge-on from Earth.) How much time does it take the star and planet to complete one orbit around their center of mass?
