Observing the sun from earth requires special precautions and equipment as direct observation with the naked eye or clear lenses causes eye damage and can result in blindness. An image of the sun can be projected directly onto paper, allowing safe observation, or a viewing tool with an appropriate filter can be used./
The simplest projector uses two sheets of stiff white paper and a pin. Take these materials outside on a sunny day.
Poke a pinhole in the center of one of the pieces of paper. This will focus the sunlight. Take the second piece of paper, and prop it up on a table so it faces the sun. This will provide an observation screen.
Hold the paper with the pinhole up toward the sun, and move it until the sun's rays fall on the observation screen. A bright disk on the paper screen appears once the pinhole aligns with the sunlight.
Find a box that is about 2 feet tall, then cut a small hole in its top. Place the pinhole paper over this hole. At the bottom of the box, cut open one side about halfway up. On the bottom of the box place the white paper screen. Aim this assembly at the sun until the disk appears.
The sun primarily affects Earth by warming up its surface through the transfer of solar energy in the form of heat and light. This ensures the continued survival of all organisms on the planet.Full Answer >
No one human can be attributed to discovering the sun, as it has existed longer than humans and is readily visible to the naked eye. However, many of the features of the sun were discovered by the Italian astronomer Galileo Galilei in the late 16th and early 17th centuries.Full Answer >
It takes the Earth approximately 365.25 days to complete one revolution around the sun. The extra quarter of a day that is gained each year is why a leap year is added to the calendar every four years. The day added in a leap year is February 29.Full Answer >
The sun heats the Earth unevenly, primarily because the Earth is covered by water and land that heat and cool at different rates. Moreover, the equator heats more intensely than the poles. The Earth is also tilted on its axis, creating seasonal differences at specific latitudes.Full Answer >