Echo
* are created by sound waves being reflected off of a large obstacle
  - used to measure distance, velocity, and the shape of objects
* is analogues
  - awards
  - imitation
  - located in bridges
  - nymph
  - reflectivity
  - replies
  - singles
  - software
* produced by defects are distinct from echoes produced by well-bonded, homogeneous materials.

### echo:

Echolalia
* is an example of perseverative speech
  - another common problem in communication for many individuals with autism
  - one of the most prevalent language characteristics of children with autism
* parrot-like repetition of a senseless word or phrase.

Eclipse
* Any eclipse occurs when one object gets between a light source and a third object.
* Most eclipse has phases.
* Some eclipse has magnitudes.
* also become shallower on the rise to outburst and practically disappear at maximum light.
* always foretell events that transpire in the future.
* are a time-tested tool of solar astronomy
  - about change, sometimes radical change
  - especially dangerous for pregnant women
  - named after their max point
  - only visible on a small part of Earth's surface
  - regular as clockwork
  - relatively common as astronomical events go
  - times of surprise developments and monumental endings or beginnings
  - total only in a narrow track along the Earth , and only for a few minutes
  - visible anywhere on the night time side of Earth
* can affect world events
  - also occur outside the solar system in eclipsing binary star systems
  - be very upsetting because of their power
  - come on suddenly acting in a lightening like manner
  - give a relationship a sense of purpose if one was lacking, or a reason for leaving
* can only happen near the lunar nodes
  - when a new moon passes between the sun and Earth
  - occur when the moon is near the ecliptic
  - sometimes years apart
* depends on factors
  - several factors
* following volcanic eruptions on Earth can appear especially dark and coppery-colored.
* generally come in pairs, although they show up in triplets from time to time
* has appearances
  - viewers
* have a bad reputation with most people as bringers of doom and gloom
  - known correlation with an increase in earthquakes
* intensify and focus energy, often for up to six months.
* is books
  - interruptions
  - phenomenons
  - ships
* occur twice a year within a two week period of each other.
* occur when Earth, the sun, and the moon are in a straight line, or nearly so
  - a satellite moves through the shadow of Jupiter
* occur when the moon passes through the earth's shadow
  - three bodies form a nearly straight line
* only happen a few times in our lives.
* provides opportunity
  - spectacular photo opportunity
* signify a tendency for change, signaled by an interruption of light to the Earth.
* slip back in the zodiac so that each occurs a few degrees earlier than the last.
* vary from just a few minutes to nearly five hours in length.
+ Solar eclipse: Astronomical phenomena
  * Eclipses are total only in a narrow track along the Earth, and only for a few minutes. Outside this path, all eclipses are partial, and places far from the track get no eclipse at all. The track can be predicted many years before it happens.