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boundary="------------F5TFXKUyn4q4Sujx60N25Ogf" Content-Language: en-US Subject: Re: [Starlink] starlink extensions over uk X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Jul 2022 08:35:23 -0000 --------------F5TFXKUyn4q4Sujx60N25Ogf Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable I haven't got Mike's nice software but I got snail mail today, so let's=20 try the back of one of the envelopes. 53 degrees north (where the existing constellation tops out) is roughly=20 the latitude of Nottingham or Stoke-on-Trent. Note that this is also the=20 latitude with the largest number of birds per km (or mile, if you so=20 prefer) of parallel. They sit almost cheek to jowl there. Now the northern tip of the UK's main islands is at around 59 degrees=20 north - that's six degrees more. One degree of latitude is roughly=20 equivalent to 10,000 km / 90 degrees =3D 111 km, so we're talking around a= =20 devilish 666 km to the north of Nottingham here as the crow flies. Lets assume Dishy points itself due south at 59 degrees. The birds are=20 at about 550 km. So doing a flat earth approximation for the moment,=20 we're having to point at a satellite 550 km up from 660 km away - that=20 gives an elevation of about 40 degrees (=3Darctan(550/660)). Ballpark. Now= =20 reduce that by the 6 degrees of difference to account for the curvature=20 of the earth and we still have around 34 degrees, allowing for a bit of=20 leeway either side if the closest bird isn't actually due south but a=20 bit to the east or west. Again, ballpark, but we're nowhere near 25=20 degrees yet. So I'd say that should cover it nicely? Where does my envelope err? GEO=20 arc protection aside for the moment, of course. And of course just=20 because Starlink offers you service doesn't mean that it's actually=20 continuous. On 25/07/2022 8:59 am, Dave Taht via Starlink wrote: > For those of you that don't follow mike's twitter feed... > > https://twitter.com/mikepuchol/status/1551288485713149952=20 > > > --=20 > FQ World Domination pending:=20 > https://blog.cerowrt.org/post/state_of_fq_codel/=20 > > Dave T=C3=A4ht CEO, TekLibre, LLC > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink=20 > --=20 **************************************************************** Dr. Ulrich Speidel School of Computer Science Room 303S.594 (City Campus) The University of Auckland u.speidel@auckland.ac.nz =20 http://www.cs.auckland.ac.nz/~ulrich/ **************************************************************** --------------F5TFXKUyn4q4Sujx60N25Ogf Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

I haven't got Mike's nice software but I got snail mail today, so let's try the back of one of the envelopes.

53 degrees north (where the existing constellation tops out) is roughly the latitude of Nottingham or Stoke-on-Trent. Note that this is also the latitude with the largest number of birds per km (or mile, if you so prefer) of parallel. They sit almost cheek to jowl there.

Now the northern tip of the UK's main islands is at around 59 degrees north - that's six degrees more. One degree of latitude is roughly equivalent to 10,000 km / 90 degrees =3D 111 km, so we're talking around a devilish 666 km to the north of Nottingham here as the crow flies.

Lets assume Dishy points itself due south at 59 degrees. The birds are at about 550 km. So doing a flat earth approximation for the moment, we're having to point at a satellite 550 km up from 660 km away - that gives an elevation of about 40 degrees (=3Darctan(550/660)). Ballpark. Now reduce that by the 6 degrees of difference to account for the curvature of the earth and we still have around 34 degrees, allowing for a bit of leeway either side if the closest bird isn't actually due south but a bit to the east or west. Again, ballpark, but we're nowhere near 25 degrees yet.

So I'd say that should cover it nicely? Where does my envelope err? GEO arc protection aside for the moment, of course. And of course just because Starlink offers you service doesn't mean that it's actually continuous.

On 25/07/2022 8:59 am, Dave Taht via Starlink wrote:
=20 For those of you that don't follow mike's twitter feed...

https://twitter.com/mikepuchol/status/15512884857= 13149952

--
FQ World Domination pending: https://blog.cerowrt.org/post/= state_of_fq_codel/
Dave T=C3=A4ht CEO, TekLibre, LLC
_______________________________________________
Starlink mailing list
Starlink@lists.bufferbloat.net
https://lists.bufferbloat.net/listinfo/starlink
--=20
****************************************************************
Dr. Ulrich Speidel

School of Computer Science

Room 303S.594 (City Campus)

The University of Auckland
u.speidel@auckland.ac.nz=20
http://www.cs.auckland.ac.nz/~ulrich/
****************************************************************
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