The Astronomy Show on Drystone Radio

 Join me, Martin Lunn MBE every Monday evening from 7.00 pm-9.00 pm on the award-winning Astronomy Show on Drystone Radio, probably the only regular astronomy show on any radio station in the country. 

I will take my weekly look at the night sky and look at all the latest news in astronomy. There will be the astronomical anniversaries this week plus the latest news from the astronomical societies in the north of England.

The Astronomy Show every Monday evening only on Drystone Radio live online at www.drystoneradio.com DAB radio in Bradford and East Lancashire, or 102 and 103.5 FM and can also be heard later on the Drystone Radio Podcast.

A little ramble through 19th century astronomy - The star cluster in Sobieski's shiled in 1869 and 1870

 Academy Saturday 28^th November 1874

—ln the years 1869 and 1870 Professor Helmert, at the Hamburg Observatory, determined the positions of some two hundred stars belonging to the cluster in Sobieski’s Shield. This cluster, which was discovered by Kirch in 1681, was carefully observed by Dr. Lamont at Munich between 1836 and 1839, and the places of about 150 stars in its most condensed part were then fixed with considerable accuracy for comparison with subsequent observations. These Professor Helmert has now made after the lapse of more than thirty years, so that if any change has occurred, and especially if there has been any condensation going on, it ought to be clearly shown by comparing the two sets of measures. The two series, however, agree so closely, that the second set may be looked upon simply as a verification of the first—a result which, though disappointing with respect to the object in view, must yet be gratifying to both the observers concerned, :. Evidence of the accuracy of the measures. Two charts present at a glance the results of the two determinations, the only noticeable difference being that Professor Helmert has included many more outlying stars in his area of operations.

www.theramblingastronomer.co.uk

Cooke Telescope tales - sale of a large achromatic telescope in 1871

The great refractor by Thomas Cooke and Sons oy York, which was shown at the International Exhibition of 1871 was sold by auction by Messrs Stevens of King Street, Covent Garden for about £750 (in 2026 that would be around £114,000). 

The instrument which had every modern appliance, and was one of the most complete ever turned out by the celebrated instrument makers was of 10 inches clear aperture and was originally priced at £1,200 (in 2026 that would be around 191,000) , but owing to the rise in wages and materials would now be charged much more. The purchaser was Mr Henley, the telegraph engineer. 

William Thomas Henley was a submarine cable maker in Greenwich. He set up the Persian Gulf Cable which was 1,651 miles long. The success of which allowed him to gain many more contracts.

                                                     www.theramblingastronomer.co.uk

Cooke Telescope Tales - occultation of Saturn observed from South Africa in 1920

 Occultation of a Star by Saturn on March 14^th 1920 made at Rondebosch, South Africa using a 6 inch Thomas Cooke telescope by W Reid, C. L O’B Dutton and W G McIntyre. 

 From the report that was received from South Africa it was assumed that many observers in the north would have seen this occultation but that does not seem the be the case. Due to this exact timings were not prepared. The report says that the star was not following its predicted path although I wonder if what they were really seeing was that Saturn was not quite in its predicted place. 

The time when the star was in contact with the rings was given as 8.46 South African Standard Time however this was a compromise. It was the time when the observers present were all certain that the star was behind the rings. Mr Reid thought it touched the rings 3 minutes earlier and at the time given was on the edge of Ring B 

At first their was very little loss of light, but as soon as it touched Ring B the light gradually faded for about a half a magnitude. It remained this way for a few seconds, when it fell a little further, and almost immediately the flicker took place – that is, the star suddenly almost went out, but not quite, it rose again fairly suddenly. After this its light fluctuated very considerably, but never reached more than a magnitude less than its original brightness. 

The star disappeared behind the planet at 8.54 and re appeared at 10.36. The seeing on the night was very good.

                                                     www.theramblingastronomer.co.uk

The Astronomy Show on Drystone Radio

 Join me, Martin Lunn MBE every Monday evening from 7.00 pm-9.00 pm on the award-winning Astronomy Show on Drystone Radio, probably the only regular astronomy show on any radio station in the country. 

I will take my weekly look at the night sky and look at all the latest news in astronomy. There will be the astronomical anniversaries this week plus the latest news from the astronomical societies in the north of England.

The Astronomy Show every Monday evening only on Drystone Radio live online at www.drystoneradio.com DAB radio in Bradford and East Lancashire, or 102 and 103.5 FM and can also be heard later on the Drystone Radio Podcast.

A little ramble through 19th century astronomy - aurora in 1874

Academy, Saturday 28^th February 1874

 Professor Domenico Cipolletti has drawn attention, in the Nazione, to the coincidence of the times of appearance and disappearance of the aurora borealis, seen at Florence on the evening of February 4, and those of the grand auroral display witnessed at the same spot February 4, 1872. The aurora was also seen at Milan and other parts of northern Italy on the 4th, on which evening strong magnetic disturbance was noted at the Vienna and Munich observatories. Professor Cipolletti exhorts observers to watch with special care for any manifestations of sudden light in Jupiter's belts, which have been proved by the observations of Lassell, Proctor, and others, to exhibit the brightest colours at those periods, in which the aurora borealis was most strongly marked.

                                                       www.theramblingastronomer.co.uk

Cooke Telescope Tales - telescopes for carlisle in 1857 and 1858

 In February 1857 William Day of Carlisle who was headmaster at the Christchurch Boys School in Carlisle purchased a 4.25 inch portable equatorial telescope. As this was early 1857 it could still be a Thomas Cooke of York telescope rather than a Thomas Cooke & Sons of York, because it was around this time that the company changed its name.

 He also  in early 1858 purchased a smaller 3.5 inch telescope also from Cookes.

                                                        www.theramblingastronomer.co.uk