Astronomia de Posició

Recursos externs

Articles

Article amb imatges xules

The Sky Above

Our senses suggest to us that Earth is the center of the universe—the hub around which the heavens turn. This geocentric (Earth-centered) view was what almost everyone believed until the European Renaissance. After all, it is simple, logical, and seemingly self-evident. Furthermore, the geocentric perspective reinforced those philosophical and religious systems that taught the unique role of human beings as the central focus of the cosmos. However, the geocentric view happens to be wrong. One of the great themes of our intellectual history is the overthrow of the geocentric perspective. Let us, therefore, take a look at the steps by which we reevaluated the place of our world in the cosmic order.

Simuladors

Amb aquest simulador pots entendre la idea principal:

Diurnal Motion (WebGL) - JavaLab

If you are asked to access your location, please allow it. Your personal data is not stored on the server. Diurnal Motion Fix the camera towards the Polaris at night. When you shoot for a few hours in that state,...

https://javalab.org/en/diurnal_motion_3d_en/

I amb aquest entens el canvi de perspectiva de la terra al voltant del sol a l’eclíptica.

Celestial Equator and the Ecliptic - JavaLab

The tilt relationship of the celestial sphere and ecliptic The celestial equator is the enlargement of the earth’s equator to the celestial sphere. Therefore, the celestial equator can be represented by a line fixed on the celestial sphere. The ecliptic...

https://javalab.org/en/celestial_equator_and_the_ecliptic_en/

Simuladors a mirar amb calma (tot l’apartat de Astronomy):

Planet Earth Simulation - JavaLab

Earth Rotation and Seasonal Changes The Earth’s rotation axis is tilted at an angle of about 23.5 ° to the orbital axis. Because of this inclination, seasonal changes occur like spring, summer, autumn, and winter. The sun illuminates the northern...

https://javalab.org/en/category/astronomy_en/planet_earth_en/

Geogebra Sol i Terra:

Sol y Tierra (sistema de coordenadas celestes)

https://www.geogebra.org/m/juSSWQmR

Vídeos de YouTube

Playlist:

Understanding the Sky

How to find our way around the sky, how it appears from different locations on Earth, and how the Sun, Moon, and planets move around the sky throughout the y...

https://www.youtube.com/playlist?list=PLrAnGxL8nxOHzZi2QikEwZAilC4opr18R

Coordenades Horitzontals:

Moció aparent de les estrelles:

Coordenades Equatorials:

Dia Sideral:

Eclíptica, constel·lacions, equinoccis i solsticis visualment

Precessió i punt àries:

Altres

Foto on hi és tot, feta per Xiwei:

Nota: l'eclíptica va pendulant degut a la precessió de la terra, cosa que fa variar el punt àries al llarg de 26.000 anys, sinó aquest seria un punt fixe a l'esfera celeste. Es pot veure millor en aquest vídeo.

Relacionat

Geometria Esfèrica