9/25/2023 0 Comments Umbra eclipseThe type of eclipse we experience depends on the type of shadow that is involved. A solar eclipse may be total, partial, or annular a lunar eclipse may be total, partial, or penumbral. However, there are different types of solar and lunar eclipses. If the Moon's shadow falls on Earth, we get to see a solar eclipse the Earth's shadow falling on the Moon results in a lunar eclipse. The Moon's umbra, penumbra, and antumbra. Business Date to Date (exclude holidays).Details of predictions for future eclipses and results from previous eclipses are available at his website. Byron Soulsby of Canberra, Australia has been investigating this phenomena for over 20 years, and every time there is an eclipse of the Moon, he publishes timing predictions and invites observers world-wide to send him their timings. The usual way of measuring this effect is to time when various features of the Moon pass itno the shadow during an eclipse. Generally it is larger when the Sun is at peak activity. However this amount is not constant, but varies acording to the state of the upper atmosphere. It changes the actual diameter of the Earth's shadow, enlarging it by about 2%. In adition to determining just how bright the Moon will be during an eclipse, the Earth's atmosphere also has another effect. However if the atmosphere contains a considerable amount of pollutants such as volcanic dust, then little light will pass into the shadow and the Moon will be very dark. If the atmosphere is very clear, then considerable light will pass into the shadow and the Moon will be bright. One, how deeply the Moon passes into the umbra, (the deeper, the darker) and two, the state of the Earth's atmosphere. Since the atmosphere is responcible for the light passing into the shadow, the amount of light there, and hence the brightness of the Moon, depends on 2 factors. Since red light most easily passes through the Earth's atmosphere, (hence red sunsets) it is predominately red light that passes into the shadow. The reason for this is that the Earth's atmosphere bends or refracts some sunlight into the shadow. However, the Moon does not generally become invisible to the naked eye during a total eclipse. In a total eclipse, all of the Moon passes through the umbral portion of the Earth's shadow, so all of the Moon becomes very dark. So that portion of the Moon becomes very dark. In this region all of the Sun is blocked out, so there is a considerable drop in the light falling on that region of the Moon. In a partial eclipse, part of the Moon passes through the umbral part of the Earth's shadow. Since only part of the Sun is blocked out in this region, the drop in light tends to be very small and it can be difficult to discern the eclipse. UMBRA: The region of the Earth's shadow where all of the Sun is blocked.Īs indicated in the diagram, a penumbral eclipse is when the moon only passes through the penumbral portion of the Earth's shadow. PENUMBRA: The region of the Earth's shadow where only part of the Sun is blocked. The 3 types of passage are shown in the diagram below. When this happens there are several possibilities as to what may be visible, depending on how the Moon passes through the shadow. During an eclipse of the Moon, the Moon passes through the shadow of the Earth.
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