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Explanation for seasonal declination

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    #32
    ps200306
    Registered Users Posts: 1,589 ✭✭✭ps200306


    I've given up trying to figure out what the hell he's trying to say. As far as I'm concerned it's elementary school science intentionally obfuscated to gain attention.


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    #33
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    ps200306 wrote: »
    I've given up trying to figure out what the hell he's trying to say. As far as I'm concerned it's elementary school science intentionally obfuscated to gain attention.
    The absolute simple made unintelligible.


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    #34
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    oriel36 wrote: »
    Yet you affirmed that this circle of illumination pivots off the equator as a means to 'explain' the seasons along with a zero degree axial inclination !

    https://apod.nasa.gov/apod/ap170319.html

    Look at this helicopter. Flying but somehow its the world around it rotating, with the blade staying still

    https://www.youtube.com/watch?v=Pu48f7s5Ru8

    A bit harder to understand than a geo cam perhaps, especially with the cyclic seen in it. Or perhaps it is not cyclic, but the horizon tilting back and forth as well...


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    #35
    oriel36
    Registered Users Posts: 462 ✭✭oriel36


    All this becomes personal again so easy to continue without the 'pivoting circle of illumination/zero degree axial inclination' mob that emerged recently in response to RA/Dec software modeling. I have made my view known that it is many magnitudes worse than a flat Earth ideology as it manipulates imaging to suit a version of a wandering Sun across the Earth's equator on the Equinoxes.

    http://community.dur.ac.uk/john.lucey/users/solar_year.gif

    https://apod.nasa.gov/apod/ap170319.html

    Ireland was once known for its learning and fairness but has adopted English intellectual pretense recently.


    https://www.timeanddate.com/sun/norway/hammerfest

    I worked in Hammerfest so as the North pole turns parallel to the orbital plane and therefore closer to the planet's circle of illumination, the circumference where the Sun is out of sight starts to shrink until it disappears at Polar sunrise on the March equinox. There are two surface rotations involved so Hammerfest will experience a rapid increase in daylight length as opposed to latitudes closer to Irish latitudes where daylight/darkness asymmetries are less severe.

    It is always difficult to leave an Irish forum where the contributors have this allegiance to English clockwork modeling and now made worse by computer software. Considering our astronomical heritage stretching back to remote antiquity, there is no sign of gentleman behaviour or even individual reasoning abilities much less the perceptive/intuitive abilities all astronomers require.


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    #36
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,695 Mod ✭✭✭✭Capt'n Midnight


    Bruthal wrote: »
    Look at this helicopter. Flying but somehow its the world around it rotating, with the blade staying still

    https://www.youtube.com/watch?v=Pu48f7s5Ru8

    A bit harder to understand than a geo cam perhaps, especially with the cyclic seen in it. Or perhaps it is not cyclic, but the horizon tilting back and forth as well...

    AFAIK front and centre is the famous Jesus nut. Edit - no it's this one

    When a helicopter is moving forward blades travel faster advancing than when they they are going back. Faster generally means more lift so they reduce the tilt angle of incidence to compensate as otherwise the helicopter would flip over.


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    #37
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,695 Mod ✭✭✭✭Capt'n Midnight


    ps200306 wrote: »
    I've given up trying to figure out what the hell he's trying to say. As far as I'm concerned it's elementary school science intentionally obfuscated to gain attention.

    No mention of the changes in eccentricity, axial tilt, and precession like in the Milankovitch cycles either.


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    #38
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Capt'n Midnight wrote: »
    AFAIK front and centre is the famous Jesus nut. Edit - no it's this one

    When a helicopter is moving forward blades travel faster advancing than when they they are going back. Faster generally means more lift so they reduce the tilt angle of incidence to compensate as otherwise the helicopter would flip over.

    They usually use flapping for the compensation of dissemetrical lift when flying forward. Flap up, and it's in effect moving against the induced downward flow, thus reducing lift. Opposite on other side. The video also shows cyclic feathering. A hovering helicopter can have same effect with winds. The winds also move the induced flow air, thus causing a hovering helicopter to climb if wind increases.

    Not much point in getting too detailed if the op couldn't see a fixed geo cam taking a pic each day at an edge on view of the day/night border as being perfectly correct as showing the seasonal lit area advance north and south.


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    #39
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Another interesting one on the helicopter in video. It looks like it's hovering on the spot. When they do this, the tail rotor counteracting the main rotor torque, also causes the helicopter to move sideways as a whole because of its sideways thrust, so some cyclic roll input is required to counteract it. So they hover on the spot with a slight off level attitude or tilt to counteract this sideways thrust.

    Anyway, back to astronomy.


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    #40
    oriel36
    Registered Users Posts: 462 ✭✭oriel36


    https://www.timeanddate.com/sun/norway/hammerfest

    In a few days, Hammerfest will see the Sun for the first time since November 23rd 2019 as the circumference where the Sun is completely out of sight begins to shrink towards the North polar latitude. At the North Pole the observation is most dramatic as there is just a single day/night cycle with one sunrise on the March Equinox and one sunset on the September Equinox.

    At the North and South Poles, the daily rotational velocity reaches zero in comparison to the maximum 1037.5 mph rotational velocity at the Equator so , it follows that the polar day/night cycle and the rotation of the Poles (and by association the entire surface of the Earth) across the fully illuminated face of the Earth over a 6 month period comes from its orbital motion.

    One of the loveliest features is that the Sun tracks from right to left at the South Pole and from left to right at the North polar latitudes -

    https://www.youtube.com/watch?v=xOCCSegL8ic

    https://www.youtube.com/watch?v=okw6Mu3mxdM


    The Earth not only orbits the Sun but orbits in a specific way and this is the point of departure for isolating the single day/night cycle experienced by all locations on Earth when daily rotation and all its effects are subtracted. People who can't recognise this will also not recognise the single day/night cycle at the North and South Poles and the cause of that cycle.


    Strip things bare by dynamical cause and then work in experiences and observations from the surface of the planet.


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