Epistulae Astronomicae – Random musings of an amateur astronomer

U Cygni – cycles upon cycles of a Mira type variable star

U Cygni – cycles upon cycles of a Mira type variable star

2018-08-30 — 0 Comments

LCplot – a program to plot light curves of variable stars

2018-08-14 — 1 Comment

Triangular numbers and the Argelander nomenclature for variable stars

2018-04-07 — 0 Comments

Towards a variable star observing program: 2. choosing and selecting stars

2018-03-30 — 0 Comments

diverse variable star charts from AAVSO

Towards a variable star observing program: 1. general considerations

2017-08-13 — 3 Comments

khi Cygni, light curve 2000-2017

notes, observations

Awesome khi Cygni – recent unusual maxima and minima

2017-08-12 — 5 Comments

Number of observations for cloudiness above 75% and below 25%. Stockholm, Sweden, astronomical observing season, period of Aug. to May, 1961-2016.

Is cloudiness increasing? The curse of cloudiness and climate change.

2017-03-26 — 3 Comments