The first step in measuring the distance between the Earth and the Sun is to measure the distance between Earth and another planet in terms of the distance between Earth and the Sun. So, let us assume that the distance between Earth and the Sun is a.Now, let us consider the orbit of Venus.To first approximation, the orbits of Earth and Venus are perfect circles around the Sun. Take a look at the diagram below (not to scale).nyway, the relevant numbers are: Earth-Sun distance, d = roughly 150 million km (defined as 1 Astronomical Unit). Radius of the Sun, R sun = roughly 700,000 km. Orbital speed of Earth, v = roughly 30 km/s. References: 1  Great Moments in the History of Solar Physics 1.
Marijuana Lighting, Marijuana Grow Lights and Lamps. To grow the indoor marijuana plants is to learn the right types of lighting systems. There are three types of systems of lighting that are excellent ones for the cannabis plants, these are: the incandescent, fluorescent, and the high intensity discharge.
As you may know CFL light can be as efficient in growing marijuana plants as HPS bulbs but you need a lot of them but that can be a very helpful thing because you can place them around the grow room and around your plants to maximize the light usage.rom these ratios you can see that the most efficient CFL bulbs are at the start of the range from 12 W to 45 W but 13 W bulbs are too weak and you would need a lot of them to grow cannabis so the best CFL lightbulb for growing marijuana is the 42 W one because it is the most efficient and will grow the biggest plants.