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.
Water around the seedlings a few inches base of the plant. It is best to water your plants first thing in the morning for best uptake. Marijuana seedlings lights. Marijuana seedlings require very little light and can be grown under CFLs (spiral compact fluorescents), tube fluorescents, LEDs and the blue light from Metal Halides (MH). Stay away from incandescent lights as they put off too much heat and too little light. The higher the Wattage your light source, the further away it should be from your seedlings unless you are using LED grow lights with good ones running nearly cold. Too far away and the plants will stretch towards the light making them weak and spindly.