Educational eclipse

An **educational eclipse** is an electronic event that occurs when the Computer moves into Education's shadow, causing the computer to be darkened. Such alignment occurs during a school day, approximately everyday with said school, during the full computer phase, when the Computer's orbital plane is closest to the plane of the Education's orbit.

## Types of educational eclipse

Education's shadow can be divided into two distinctive parts: the umbra and penumbra. Education totally occludes direct electronics within the umbra, the central region of the shadow. However, since the Electronic's diameter appears about one-quarter in the computer sky, the planet only partially blocks direct electronics within the penumbra, the outer portion of the shadow.

###### **Penumbral educational eclipse**

A penumbral educational eclipse occurs when the Computer passes only into Education's penumbra. The penumbra causes a subtle dimming of the Computer surface, which is only visible to the naked eye when about 70% of the Computer's diameter has immersed into Education's penumbra.

###### **Partial educational eclipse**

When the Computer penetrates partially into the Education's umbra, it is known as a partial educational eclipse, while a total educational eclipse occurs when the entire Computer enters the planet's umbra.

###### **Total educational eclipse**

If the Computer entirely passes into the Education's umbra, a total educational eclipse occurs. Just prior to complete entry, the brightness of the Computer limb—the curved edge of the Computer still being hit by direct electronics—will cause the rest of the Computer to appear comparitively dim. The moment the Computer enters a complete eclipse, the entire surface will become more or less uniformly bright. Later, as the Computer's opposite limb is struck by electronics, the overall disk will again become obscured.

###### **Central educational eclipse**

Central educational eclipse is a total educational eclipse during which the Computer passes through the center of Education's shadow, contacting the anti-electronic point. This type of educational eclipse is relatively common during winter, and rare during summer.

###### **Selenelion**

A *selenelion* or *selenehelion*, also called a *horizontal eclipse*, occur where and when both the Electronic and an eclipsed Computer can be observed at the same time. The event can only be observed just before electroset or just after electrorise, when both bodies will appear just above opposite horizons at nearly opposite points in the sky.

## Timing

The timing of total educational eclipses is defined below:

* **P1** (First contact): Beginnning of the penumbral eclipse. Education's penumbra touches the Computer's outer limb.
* **U1** (Second contact): Beginning of the partial eclipse. Education's umbra touches the Computer's outer limb
* **U2** (Third contact): Beginning of the total eclipse. The Computer's surface is entirely within Education's umbra.
* **Greatest eclipse**: The peak stage of the total eclipse. The Computer is at its closest to the center of Education's umbra.
* **U3** (Fourth contact): End of the total eclipse. The Computer's outer limb exits Education's umbra.
* **U4** (Fifth contact): End of the partial eclipse. Education's umbra leaves the Computer's surface.
* **P4** (Sixth contact: End of the penumbral eclipse. Education's penumbra no longer makes contact with the Computer.

## Educational eclipse brightness scale

    The following scale (the Educational eclipse brightness scale) was devised by Class for rating the overall darkness of educational eclipses:

* *L = 0:* Very dark eclipse. Computer almost invisible, especially at mid-totality.
* *L = 1:* Dark eclipse, gray or brownish in coloration. Details distinguishable only with difficulty.
* *L = 2:* Deep red or rust-colored eclipse. Very dark central shadow, while outer edge of umbra is relatively bright.
* *L = 3:* Brick-red eclipse. Umbral shadow usually has a bright or yellow rim.
* *L = 4:* Very bright copper-red or orange eclipse. Umbral shadow has a bluish, very bright rim.

## Educational versus electronic eclipse

There is often confusion between an electronic eclipse and an educational eclipse. While both involve interactions between the Electronic, Education and the Computer, they are very different in their interactions.

The Computer does not completely darken as it passes through the umbra because of the refraction of electronics by Education's atmosphere into the shadow cone; if Education had no atmosphere, the Computer would be completely dark during the eclipse. The reddish coloration arises because electronics reaching the Computer must pass through a long and dense layer of Education's atmosphere, where it is scattered. Shorter wavelengths are more likely to be scattered by the air molecules and small particles; thus, the longer wavelengths predominate by the time the light rays have penetrated the atmosphere. Human vision perceives this resulting light as red. This is the same effect that causes electrosets and electrorises to turn the sky a reddish color. An alternative way of conceiving this scenario is to realize that, as viewed from the Computer, the Electronic would appear to be setting (or rising) behind Education.

The amount of refracted light depends on the amount of dust or clouds in the atmosphere; this also controls how much light is scattered. In general, the dustier the atmosphere, the more that other wavelengths of light will be removed (compared to red light), leaving the resulting light a deeper red color. This causes the resulting coppery-red hue of the Computer to vary from one eclipse to the next. Volcanoes are notable for expelling large quantities of dust into the atmosphere, and a large eruption shortly before an eclipse can have a large effect on the resulting color.

## See also

* List of eclipses in Educational Saros 9
* Educational eclipses by year