Check the comments…

Check the comments…

[Updated and edited in September the 28th 2016 ]

(This post was a ‘copy&paste’ from an answer to a comment).

Thank you very much for your comment.

I would like to write about all topics (specially on this one) in a better structured way, but apart from my schedule for tasks and topics, the planet and people living on it (worldwide events), have their own [schedule], and the planet Earth is one of those entities who have their own schedule, so in this case…

December the 24th, for instance, requires more attention, because, according to web.romascuola information on the lemniscata | annalema curve for shifts among average mid-day and true mid-day (the time in a day when the Sun reaches its maximum height on the horizon, every day), and the proximity of Winter  solstice (the time in a year when daylight hours duration reaches its minimum, and starts to increase in duration again, near December the 22nd, every year (here, in northern hemisphere and the other way around in the southern hemisphere)).

December the 24th is one of the four days in the year when shift between true and average mid-day duration is zero, so no correction must be done for mid-day for the places below the meridian of reference for each country, and the rest of locations only have to correct the true time shift from that due to the geographical distance in Longitude (East-West) from the official time meridian of reference, that is to say (=240 clock seconds per 60 arc minutes | 3600 arc seconds) four minutes in our clocks, per one arc degree in circumference angle of difference to the official time meridian of reference.

Bear in mind there is a longitude difference between london (GMT), and Reijkiavik of… say -22º degrees, being the Icelandic official meridiane time for reference (base for UTC) one hour geographically shifted from greenwich, despite the fact that Iceland and United Kingdom are both into the same official time reference. And being then an hour and a half the true time-shift between London and Reijkiavik.

The rest of the days in a year (apart from the other three dates of zero shift between average and true), there is a shift in duration from the true day duration (the time length the Earth takes to rotate 360 degrees, passing below the same exact position from an observer situated in a fixed point out of the Earth’s atmosphere, in the space upon it; observer who is revolving at the same velocity than the Earth around the Sun [thus same translation velocity], and this renders differences in mid-day exact time of occurrence, and this (along with overboosted nutation and precession movements [1], which are not normal at all nowadays because of electromagnetic industries exploitation) is why lemniscata has that shape.

[1] The difference in temperature and other weathery conditions between winter and summer  is because of the difference in rotation axel inclination: in summer the pole points toward the Sun, in winter points in the opposite direction.

So, in equinoxes is where the middle value is, having a 0º value in the lemniscata, that you can see on the left vertical margin of the image.

The 23º on either side above and under the 0º position correspond with winter and summer inclinations.

So, a precession-nutation movement much wide and frequent than it should be makes the weather conditions vary accordingly, this is why nowadays talking about the weather is not considered as a convenient, and polite small talk anymore, and starts to be regarded to as a rude behaviour… 🙂

Observer who is not revolving around, but floating above the Earth, just as the arm of a turntable is, before it lands upon the record’s surface.

 

Which is NOT the case for geostationary satellites, who have to turn with the same angular velocity than that of the Earth, at least in one of their possible shifts [drifts] in space, stationary orbit, being the same line trajectory.

Indeed they are still upon the Earth’s surface, but turn with the same Earth’s rotation speed, ‘stuck’ to the Earth, MAINLY because of electromagnetic (which is much stronger than [2] gravitatory) field.

[2] In atomic physics and chemistry, the unit of charge is called electron-volt, eV, and is some -19 power of ten scale, that’s a tenth of a Spanish trillionth 10^-18 (una décima parte de una trillonésima de coulomb), and for English speakers a tenth of an attometer of coulomb, a very tiny amount of charge when compared to the 400000 potetial difference (volts) which carry the high voltage grid lines  usually, before being transformed to mid (35000 to 1200 volts), and low (1200 to 250|115) voltages. Remember an Ampere is a coulomb passing through one meter in one second.

electrovolt, the elementary charge (e, or 1.6021766208(98)×10−19 C

1,6×10−19 C aproximadamente

Keeping the same position in space above the surface, thus the same height plane; and meaning ‘stationary position’ being still, when seen from the Earth, just as a sticker on an extension paper stripe outside but stuck to a record with an adhesive tape would bee seen as ‘still’ by a minuscule man who were sitting on that same record.

Although they turn with a slightly faster speed actually, because satellites swirl around with a radius length [the paper stripe] slightly longer from the center of the planet, so linearly considered in km/h or mph go much faster, and regardless of being swirling with the same angular speed;

The average duration of 24 hour in a day, is what (almost) everyone understands as a day (specially in Rome and Edinburgh, having on account they shoot a cannon (in Gianicolo, and in the Edinburgh Castle which is situated on top of Castle Rock) at mid-day  (mezzogiorno in Rome) and at one o’clock GMT in Edinburgh, exactly, to make aware all of the city, when background noise is not too loud to hear it, mezzogiorno in Rome, or one o’clock in United Kingdom have arrived, on average, exactly! in a much more noisy way than that of carillons.

So despite my intention of writing in a better structured way, I sometimes have to give up and abandon game programming, or posts series, for the benefit of those time freaks who carry themselves a portable sundial to determine the exact time… 🙂
(Despite of cannons).

Acerca de María Cristina Alonso Cuervo

I am a teacher of English who started to write this blog in May 2014. In the column on the right I included some useful links and widgets Italian is another section of my blog which I called 'Cornice Italiana'. There are various tags and categories you can pick from. I also paint, compose, and play music, I always liked science, nature, arts, language... and other subjects which you can come across while reading my posts. Best regards.
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