For those who celebrate, may you experience peace and happiness on this special day. Eid Mubarak!
The Shawwal #moon was seen, which ends the #Ramadan 1447 AH fast for Muslim communities.
Determining Eid al-Fitr in the USA uses both #moonwatch ing and #astronomy calculations.
The Blue Mosque is a historic #mosque in Tabriz, Iran. The mosque was constructed in 1465 upon the order of Jahan Shah, the ruler of Kara Koyunlu. photograph Hameddaeipic 2020 via Wikimedia Commons (CC-BY-SA 4.0)
For those who celebrate, shake off your #winter hibernation & sing w/ #nature this #spring. #Ostara blessings! Happy #vernalequinox!
On the #equinox, the #Sun rises due #east and sets due #west. The length of daylight and darkness is nearly balanced, but #refraction gives us a little more light.
photograph courtesy Gosia K 2020 via Pixabay
#calendar #timekeeping #astronomy #season
March 20 2026 14:46 UT1
#Sun crosses #celestialequator heading northward,
#vernalequinox in #northernhemisphere
Our #daylight periods will continue to lengthen until #summersolstice; in the
#southernhemissphere, the #seasons are reversed.
composite photograph courtesy Tunç Tezel/IAU OAE (CC BY 4.0)
#astronomy #astrophotography #calendar #equinox #timekeeping #solstice
Fun fact: The best way to enable ptp_kvm on #coreos is ensuring the kernel arg ignition.platform.id=qemu is set. Then coreos-platform-chrony-config.service will load ptp_kvm and configure chrony accordingly.
rpm-ostree kargs --replace=ignition.platform.id=qemu
I was wondering why another VM at Ionos had ptp_kvm working without me setting it up. It turned out my Hetzner VM had ignition.platform.id=metal which prevents automatic ptp_kvm setup.
Today I learned: Hetzner supports ptp_kvm for time sync, no ntp servers necessary (although I still have them in my config).
Is #DaylightSavingTime sending waves through your routines? or will it soon be?
Promoted as #energyefficiency measure during #WWI & #WWII, the US used year-round #DST, or War Time, during WWII
Today, the #health & #energy benefits of DST are controversial.
illustration courtesy of G. Altman via Pixabay
#timekeeping #histsci #time #astronomy #spring #sunlight #season
Grand Seiko: The History of Japan's Finest Watchmaker https://shop.uncrate.com/products/grand-seiko
I'm going to talk about calendars again.
Web pages and popualr books often state that calendars can be solar or lunar, and lunisolar calendars combine both types. This is exactly backwards. Every polity with any sort of state-like organisation starts off with a lunisolar calendar, which may drop the lunar correlation to become purley solar. (There is only one purely lunar calendar, and it too is descended from a lunisolar ancestor).
1/?
Unironically I love reforms like this, though
https://piefed.social/c/historymemes/p/1805447/unironically-i-love-reforms-like-this-though
Jennifer Lynn Bartlett
Markus Lindenberg
SydneyJim
Sarah A
Infrapink (he/his/him)
PugJesus