Title text: If you live in the Northern hemisphere, anyway. In the southern hemisphere, due to the coriolis effect, babies are born nine months BEFORE they're conceived.
Horoscopes are supposed to predict someones personality, or future, depending on the position of planets and stars at the time of their birth and now, especially based on their (zodiac signs). Today, horoscopes are admitted to be pseudoscience which is why the comic jokes about the fact that it's horoscopes at least may be true (at least for someone born in The United States, aftre a full term pregnancy). "Real" horoscopes are typically so vague that they could be true for anyone regardless of their sign.
Since the 12 category zodiac signs in horoscopes are based on birthday dates, Randall can do some informed guess about the context of someone's conception (i.e., what was happening nine months before they were born), depending on the sign. For example, Virgo are born mostly in September, so they were conceived shortly before Christmas, leading to the guess "You may have been conceived while a Christmas song played". So Randall's "predictions" are possible, if not useful. Contrary to popular horoscopes, here there is an actual reason why for instance the horoscope for Virgo is most likely true for Virgos and so on. See detailed description in the table below.
The title text refers to the Coriolis effect which occurs to a body that is moving on an object that is spinning. Since the Earth is rotating this leads to the fact that something that is moving on Earth feels a force (the Coriolis force) which causes the moving object to be deflected to the right in the northern hemisphere and to the left in the southern hemisphere. This effect is the reason that weather systems (most clearly seen for hurricanes) rotates in one direction in the northern hemisphere and in the opposite direction in the southern hemisphere. There is also a common misconception that water will spin down a plug hole in a different direction in the two hemispheres (see also 843: Misconceptions). The Coriolis force can also be experienced on a much smaller scale, for instance if you try to walk on a spinning carousel.
Randall plays on misconceptions regarding this fictitious force to make a joke involving reversing the flow of time. So whereas babies are born nine months after conception in the northern hemisphere (clockwise) the Coriolis effect is the reason why babies are being born nine months before in the southern hemisphere (counterclockwise).
In reality, the relevant difference between the northern and southern hemispheres is that the meteorological seasons are a half-year out of phase between the two. This renders some of the "predictions" (such as a hot day in August or people trapped by snow in January-February) invalid for the southern hemisphere.
Table of Astrological signs
Here below is a table with data and explanation of the individual horoscopes:
|Astrological sign||English name||Date range||9 months before||Horoscope prediction||Explanation|
|Aries||The Ram||March 21 - April 21||June 21 - July 21||You may have been conceived after a 4th of July fireworks show||In the US the Independence Day is celebrated on the 4th of July, and this is customarily celebrated with huge fireworks.|
|Taurus||The Bull||April 20 - May 20||July 20 - August 20||You may have been conceived on a hot August day||In most of the northern hemisphere there are many hot days in August.|
|Gemini||The Twins||May 21 - June 21||August 21 - September 21||You may have been conceived as the leaves began to change||In the northern part of the northern hemisphere the autumn starts at the end of this time period, so the leaves will begin to change color.|
|Cancer||The Crab||June 21 - July 21||September 21 - October 21||You may have been conceived by people trying on costumes||This period ends 10 days before Halloween, so it is not unlikely that the people who conceived you (mom and dad) tried on their new costumes when they made you.|
|Leo||The Lion||July 22 - August 23||October 22 and November 23||You may have been conceived during thanksgiving||Thanksgiving is celebrated in the US on fourth Thursday of November, which for only two out of seven years will lie before the 23rd of November. However many people are born before 9 months so it is not unlikely for someone born as a Leo to be conceived on this day.|
|Virgo||The Maiden||August 23 - September 22||November 23 - December 22||You may have been conceived while a Christmas song played||It is very common for Christmas songs to be played in the month before Christmas|
|Libra||The Scales||September 22 - October 23||December 22 - January 23||You may have been conceived after a new year's eve party||Since New Year's Eve always falls on December 31, and since the party goes on into the new year this fits with Libra. As it is very likely that people are together in a way that may lead to conception at this type of parties, there may even be rather more than a 30th part of the people that are Libra that are conceived at such a party.|
|Scorpio||The Scorpion||October 23 and November 22||January 23 - February 22||You may have been conceived by people stuck inside after a long winter||This period is during the coolest part and towards the end of the winter. People may even be forced to stay at home due to snow. When people have nothing else to do many babies are born 9 months later.|
|Sagittarius||The Archer||November 22 - December 21||February 22 - March 21||You may have been conceived during March madness||Although originally the early part of the mating season for the European Hare, in which females fight off male suitors, in a US context this is an American college Basketball tournament .|
|Capricorn||The Goat||December 22 - January 19||March 22 - April 19||You may have been conceived during a sexy Easter Egg hunt||Easter falls between March 22 and April 25 so most Easter Egg hunt, sexy or nor, will fall in the relevant period to conceive Capricorn children. The goal of an Easter egg hunt can be to find as many eggs in a given time, or find a sequence of eggs, each containing a clue to the next. It is not difficult to think of adult variations on these themes. Most Egg hunts do not involve people who should make them sexy!|
|Aquarius||The Water Carrier||January 20 - February 18||April 20 - May 18||You may have been conceived on Mother's day||Mother's Day in the USA,and some other countries, is on the second Sunday in May, between the 8th and 14th of May.|
|Pisces||The Fishes||February 19 - March 20||May 21 - June 21||You may have been conceived at someone's wedding||It is not uncommon that people meet and even go so far as to risk conceiving a child at someones wedding. The tradition of a June Bride may be an old one and hence explains the reference for Pisces which lies mainly in June. ABC claim that in the 15th and 16th century, May would have been the month for an "annual bath", and moreover June is named for Juno, goddess of the home and hearth.|
- [Above the frame:]
- With an actual basis in fact
- [A table with the name of each astrological sign in the first column and a horoscope for each sign in the second column.]
|Aries||You may have been conceived after a 4th of July fireworks show|
|Taurus||You may have been conceived on a hot August day|
|Gemini||You may have been conceived as the leaves began to change|
|Cancer||You may have been conceived by people trying on costumes|
|Leo||You may have been conceived during thanksgiving|
|Virgo||You may have been conceived while a Christmas song played|
|Libra||You may have been conceived after a new year's eve party|
|Scorpio||You may have been conceived by people stuck inside after a long winter|
|Sagittarius||You may have been conceived during March madness|
|Capricorn||You may have been conceived during a sexy Easter Egg hunt|
|Aquarius||You may have been conceived on Mother's day|
|Pisces||You may have been conceived at someone's wedding|
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