What is upper and lower transit astronomy?
Upper meridian transit: the celestial object moves across the upper meridian, the semi-circle above the observer’s horizon. Lower meridian transit: the celestial object moves across the lower meridian, the semi-circle below the observer’s horizon.
What is upper and lower culmination?
Except at the geographic poles, any celestial object passing through the meridian has an upper culmination, when it reaches its highest point above the horizon, and nearly twelve hours later, is followed by a lower culmination, when it reaches its lowest point. …
What is lower meridian?
The Lower Meridian is the semi-circular segment of the meridian that is below the observer’s horizon. On the opposite side of the celestial sphere from the lower meridian is the upper meridian. A Lower Meridian transit occurs when a celestial object moves across the lower meridian.
What does lower culmination mean?
Definition of lower culmination astronomy. : the crossing of a circumpolar object over the part of the celestial meridian between the visible pole and the horizon.
What is the difference between transit and transition?
As nouns the difference between transit and transition is that transit is the act of passing over, across, or through something while transition is the process of change from one form, state, style or place to another.
What happens during a transit?
transit, in astronomy, the passage of a relatively small body across the disk of a larger body, usually a star or a planet, occulting only a very small area. Mercury and Venus periodically transit the Sun, and a moon may transit its planet.
What does the decrease in luminosity during a transit tell you about the planet’s size?
For a star the size of the Sun, the transit of a Jupiter-size planet will cause a decrease in apparent luminosity of about 1%, while this decrease will be of about 0.001% for a planet the size of the Earth. This method makes it possible to determine the radius of the planet as well as its period of revolution.
What is midnight culmination?
When a planet or star is crossing the meridian it is at the highest altitude it reaches in the sky, and therefore at its farthest from dust and horizon haze. This is called its meridian transit or culmination. Transits the meridian at midnight.
What is Moon meridian?
A meridian is a location’s longitude (a line that runs from the North Pole to the South Pole of Earth). When we use the word meridian, it’s usually referring to the moment that the Moon crosses or passes a location’s meridian; this marks the exact moment when the Moon reaches the highest position in the sky.
Which point of the horizon do stars culminate?
meridian
At the Earth’s equator, the Celestial Equator is directly overhead, and the poles are on opposite sides of the horizon. All stars are visible as they rise, culminate at the meridian, and set.
