Since I talked about the Easter name earlier today,
I though I would give the standard answer on how they pick the date
for Easter, i.e. the first Sunday after the first full moon after
the vernal equinox.

I look it up an discovered I was not quite correct. The U.S. Naval
Observatory offers a more interesting and arcane answer!

Here is the introduction to their answer!

The commonly stated rule, that Easter Day is the first Sunday after
the Full Moon that occurs next after the vernal equinox, is somewhat
misleading because it is not a precise statement of the actual
ecclesiastical rules. In order that the date should be
incontrovertibly fixed, and determinable indefinitely in advance,
the Church constructed tables to be used permanently for calculating
the age of the Moon. Easter is determined by the "ecclesiastical
moon" defined by these tables, which is not strictly identical with
the real Moon. In addition, the vernal equinox (the time at which the
apparent longitude of the Sun is zero degrees) is fixed at March 21,
not by the actual motion of the Sun. Moreover, the date of Easter is
determined independently of any meridian of longitude, and is always
the same in all time zones, unlike astronomical phenomena.

--- If this has not brought “tears to your eyes” you can get the
full details by clicking on the Naval Observatory site below ! ---

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Source: http://aa.usno.navy.mil/AA/faq/docs/easter.html
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You should note that this is the Western Easter. The Eastern Churches
have a different interpretation and thus a different date. Many
erroneously think it is due to the difference between the Gregorian
and Julian Calendars. This is not the case since both Easters are
derived from astronomical phenomena regardless of how the calendars
differ. For example, certain Eastern churches use the same formula but
then insist that it is the next Sunday after Passover has ended.
As a result most years have the Eastern Church Easter a week later
than the Easter in the Western Church. About once every 7 years they
line up as it did on April 15, 2001 . You can also have a very wide gap, as in 2002, when the Western Church had it on March 31 and the Eastern Church had it on May 5. This happens about once every 11 years.

Easter comes to us through the Anglo-Saxon Eastre, and usually found
in the plural, Eastron. The German word is Ostern. It stands for
the heathen festival at the vernal equinox in April, honoring the
Teutonic goddess of dawn. This is why the word Easter is tied in
with the word for East. Aurora.

It was not uncommon to convert or link pagan holidays with Christian
holidays to make the conversion process more palatable to the pagan
population. (For example, the Christmas date was moved so it could
be linked with the Roman Saturnalia at the Winter Solstice.)

Other cultures, such as Russia, use the older terms pascha or paska
that link Easter with its roots in the Passover.

If you’re too young to remember, a trolley looks like a bus, rolls
on tracks like a railroad car, is powered from overhead wires,
and is usually found in cities. (Today, very few cities use
trolleys.) Trolley systems were also called “interurban”.

Transportation and technology provides us with some of the weirdest
coinage of words. Trolley is no exception.

A trolley normally picks up electricity from a long pole on the roof.
The spring-loaded pole has a wheel on the end that rolls on an
electrified overhead wire. This wheel is called the troll, thus
trolley was named after this little wheel.

So where did troll come from? The Welsh troell means wheel, reel,
pulley, windlas, etc. The old French troul, trouil (treuil) means
reel, winch.

So how did the word troll get linked to rotating devices?

Animals that had a certain saunter or gait gave the appearance of
rotation to their motion. Also, hounds on the move in packs
would sometimes swarm or swirl in a sort of rotary motion.

The old French word for this motion was troller (trôler): “hounds
to trowle, raunge, or hunt out of order”. (from Cotgrave, R., an
old French-English dictionary, 1611)

So . . . trolleys ultimately got their name from swirling dogs!

Carnival has an interesting etymology and it is tied in with the
Christian season of Lent. Lent begins on Wed. The word Carnival
literally means "to remove meat"?

French: Carnaval Italian: Carnevale from the Latin carnelevarium,
carnilevamen or derived from the original Latin: Carnem Levare . .
to remove meat . . or . . down with meat . . or . . farewell to meat.

As with Mardi Gras (French for fat Tuesday), carnival is celebrated
on the Tuesday before Ash Wednesday. This is the beginning of Lent,
when people have to start fasting from meat. In the old days
Carnival was another name for Shrove Tuesday or Shrove-tide.
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Trivial Notes: to shrove or confess (repent) your sins, and to begin
fasting (from meat).

Certain Eastern Rite Christian churches start their Lent on the
Monday before Ash Wednesday and skip the Tuesday festival!

The start of lent is based on the astronomical setting of the
Easter date (which is close to the astronomical selection of Passover). In the Western church, Ash Wednesday can be as early
as February 3 and as late as March 9.

Lent is supposed to be “40 days” of fasting but there are 46 days
between Ash Wednesday and Easter. This is because Sundays are not
counted in the fast!

The problem is they pressurize the cabins to an equivalent altitude
of 8000 feet and not the pressure found at sea level. This keeps
the flexing stress down on the aircraft body, especially if a high
flying plane makes a lot of short hop landings. The aircraft would
overly expand and contract with each landing cycle if they used full
sea level pressure. The less stress the aircraft body gets, the more
longevity they can get out of the airframe. I would speculate that
they would have to make the body more robust if they decided to use
sea level pressure (14.7 LB/sq. in). The 8000 foot specification saves
carrying the additional weight that would be needed to beef up the
cabin structure if they flew at high altitude with inside pressure
at sea level.

Look at the bright side. If you land in Santa Fe, NM, you will
already be adapted to the +7000 foot altitude!

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I was surprised at how many sites I found on the Internet when I
plugged in "Cabin Pressure at 8000 feet".

It seems that this 8000 foot equivalent pressure gives problems
to people who scuba dive right before a flight. Check out the sites.