Sky & Telescope - USA (2019-08)

RE TR OG RA DE M OT ION :^ G RE GG DI ND ER MA N^ / S& T skyandtelescope.com • AUGUST 2019 59 Sun-centered — or heliocentric ...

Kepler Anniversary 60 AUGUST 2019 • SKY & TELESCOPE Kepler (1571–1630). Their collaboration sparked a sweeping change in our ...

skyandtelescope.com • AUGUST 2019 61 the complete store of his data, fearing that it might support Copernicus’s system, not his ...

Kepler Anniversary 62 AUGUST 2019 • SKY & TELESCOPE Cosmographicum. Several chapters were primarily mysticism, replete with ...

skyandtelescope.com/australia2019 As you travel in comfort from Rome to Florence, Pisa, and Padua, visit some of the country’s g ...

UN LE SS NO TE D,^ AL L^ P HO TO S^ P RO VID ED BY AU TH OR IMAGING TIPS by Jeff Dai 64 AUGUST 2019 • SKY & TELESCOPE W e ar ...

SE LFI E^ S TIC K^ A ND M OU NT :^ S EA N^ W AL KE R^ / S& T skyandtelescope.com • AUGUST 2019 65 choose a phone with built- ...

Imaging Tips 66 AUGUST 2019 • SKY & TELESCOPE small rechargeable battery pack with USB output, along with your phone’s charg ...

skyandtelescope.com • AUGUST 2019 67 shoot longer exposures, or even multiple exposures that you can later stack to produce an e ...

S&T Test Report by Alan Dyer AL L^ P HO TO S^ B Y^ T HE AU TH OR Nikon’s Mirrorless Z6 We test this new mirrorless camera we ...

identical to that of Nikon’s popular D750, a favorite DSLR camera of mine for astrophotography. Pixels in both cameras are 5.9 m ...

S&T Test Report 70 AUGUST 2019 • SKY & TELESCOPE Live View The Z6’s Live View offers three levels of magnifi cation, per ...

skyandtelescope.com • AUGUST 2019 71 Deep-sky Imaging The tough test is long-exposure deep- sky imaging. Problems that can remai ...

72 AUGUST 2019 • SKY & TELESCOPE cameras using just a hardware inter- valometer. The Z6 uses the same DC-2 connector as the ...

Stauer... Afford the Extraordinary.® H ere’s a memorable beach moment: You’re basking in the warm sun, toes in the sand, letting ...

ASTRONOMER’S WORKBENCH by Jerry Oltion Better Balance Weights Fine-tune your scope’s balance with these simple weights. LIGHTWEI ...

SHARE YOUR INNOVATION º Do you have a telescope or observing accessory that S&T readers would enjoy knowing about? Email you ...

u GALACTIC MASHUP Kent Wood The distorted appearance of spiral galaxy NGC 3718 in Ursa Major is thought to be the result of grav ...

Gallery showcases the fi nest astronomical images submitted to us by our readers. Send your best shots to gallery@skyandtelescop ...

ACCESSORIES Place Your essential source for astronomical products Market BOOKS 78 AUGUST 2019 • SKY & TELESCOPE ADVERTISE IN ...