2 Measuring vitamin D levels is also expensive, costing between $50 and $220 per test in commercial laboratories for patients without insurance. Another challenge is that the level of 25-hydroxy-vitamin D that should be considered normal is unclear.
The closer a planet is to the sun, the shorter the time to complete one revolution is. Mercury, for example, has an orbital period of 88 days while it takes Jupiter about 11.86 years. The period of the Earth's orbit is usually thought to be 365 days as calendars show. However when averaged it is actually about 365.25 days, which requires an extra day on the calendar every four years (causing a leap year). Contradictions within orbit times are probably caused by the ages of the sources.
The orbital period of the earth is 365.256366 days, or 1.0000175 years. About a year. That's how we define the year-it's the time it takes the earth to make one complete orb â¦ ital trip around the sun.ince the earth and mars both orbit the sun, the distance is changing all the â¦ time. In 2003, the orbits lined up, and Mars came within 55 million kilometers. Driving your car at 50km/hr, it would take 114 years to reach Mars when it was 55 million kilometers away.