1. Constellations appear to move across the night sky
2. Due to Earth's rotation
3. Constellations move westward
4. Visibility changes throughout the year
5. Due to Earth's orbit around the Sun
Diurnal cycle
Constellations rise in the east, reach their highest point (culmination) in the south, and set in the west. This repeats daily following the Earth's rotation.
Observer's latitude impacts how constellations move in the sky
Constellations
Outline or patterns in the night sky
Represent animals, mythological persons or creatures
Constellations by season
Orion (January-March)
Leo (April-June)
Scorpius (July-September)
Taurus (October-December)
Seasonal variations in constellations are due to the tilt of the Earth's axis
Constellations
Used for navigation and storytelling by cultures
Famous constellations
Orion
Ursa Major (Big Dipper)
Cassiopeia
Draco
Cygnus
Canis Major (Dog Star)
Sirius is the brightest star in the night sky
Astrology predictions and beliefs about constellations' influence lack scientific credibility
Claims about healing powers or lunar influence on behavior of celestial bodies are pseudo-scientific
LAN cable
Used to bring internet connection to TVs and computers
Straight through LAN cable
Used to connect different types of host to each other
Maximum distance is up to 100 meters or 328 feet
To create a LAN cable
Prepare tools, strip and untwist wires, arrange it and insert to the rj45, and crimp it, repeat all steps, then test
Link speed
Reflects the internet's actual speed
Testing Ethernet cables
1. Plug both ends to the rj45 sucket, then turn on the tester
2. Make sure that there is a light indicating its number
3. If both sides reaches number 8, then the ethernet cable is good
