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NASA's picture of the day demonstrates what happens if you leave your camera on timelapse while you fall asleep and then compose the resulting images into one. You get a picture of the movement of the stars as the Earth rotates!

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purplecat

April 2026

S	M	T	W	T	F	S
			1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30

Tags

100 papers [10]
absent friends [2]
academia [94]
- dead scientists [2]
- edinburgh informatics [3]
- groups
  - dream [2]
- impact [1]
- public understanding [28]
  - lego rover [21]
- publications [57]
- scientists
  - aaron sloman [1]
  - alan bundy [4]
  - douglas hofstadter [1]
  - john mccarthy [2]
- talks [22]
- teaching [1]
administrivia [1]
agents of shield [1]
ai [28]
- agents [24]
  - ail [9]
  - bdi [11]
    - goals [2]
  - groups [3]
  - languages
    - agentspeak [1]
    - oopl [1]
  - organisations [3]
- automated reasoning [7]
  - rippling [1]
  - sat [1]
  - smt [1]
- ethics [7]
- explainability [2]
- hybrid systems [1]
- knowledge representation [1]
- lego robots [1]
- planning [1]
- robotics [4]
aisb [10]
amazon [1]
anecdote [1]
arthuriana [6]
bernice summerfield [6]
- review [5]
birthday [11]
books [54]
- author
  - andrew cartmel [3]
  - ben aaronovitch [4]
  - c s lewis [1]
  - charlotte bronte [1]
  - craig hinton [2]
  - david mcintee [1]
  - david whittaker [1]
  - dorothy l sayers [1]
  - iain m banks [2]
  - ian rankin [2]
  - j r r tolkien [1]
  - jacqueline rayner [2]
  - jane austen [1]
  - jeff vandermeer [1]
  - jim mortimore [1]
  - jonathan blum [2]
  - justin richards [3]
  - kate orman [2]
  - kelly hale [1]
  - lance parkin [4]
  - lawrence miles [6]
  - mags halliday [5]
  - malcolm hulke [1]
  - marc platt [2]
  - mark michalowski [3]
  - mary stewart [1]
  - megan whalen turner [3]
  - michael moorcock [2]
  - neal stephenson [3]
  - paul cornell [4]
  - paul dale smith [5]
  - paul magrs [11]
  - philip purser-hallard [10]
  - phyllis ann karr [1]
  - rob shearman [3]
  - rosemary sutcliff [2]
  - sara paretskey [1]
  - shakespeare [1]
  - simon guerrier [2]
  - terrance dicks [2]
  - terry pratchett [1]
  - tolkien [3]
castle [1]
christmas [2]
class [7]
- review [7]
computer science [15]
- complexity theory [4]
- game theory [5]
  - economics [1]
- np problems [1]
- verification [3]
  - induction [1]
conferences [3]
- aamas [1]
- arw [1]
- clima [1]
conventions [6]
- eastercon [11]
  - 2010 [2]
  - 2011 [4]
  - 2012 [1]
  - 2015 [1]
  - 2025 [1]
- lass o gowrie [1]
crochet [41]
- amigurumi [11]
- garment [5]
- moogly cal [9]
- non-euclidean [10]
current events [25]
dark [1]
- icons [1]
diary [14]
doctor who [1029]
- books [55]
  - annual [9]
  - cover [59]
    - benny adventure [1]
    - eda [6]
    - misc [9]
    - missing adventure [1]
    - new adventure [13]
    - nuwho [2]
    - pda [10]
    - target [17]
  - edas [2]
  - nas [4]
  - new series [9]
  - pdas [1]
  - storybook [1]
  - time and relative disse [5]
- comic [11]
  - fifth doctor [2]
  - first doctor [3]
  - fourth doctor [2]
  - second doctor [2]
  - sixth doctor [2]
  - third doctor [1]
- costume bracket [133]
- factsheet [1]
- fandom [2]
- fanzine [8]
  - channel d [1]
  - dwb [2]
  - skaro [1]
  - tides of time [1]
  - web planet [4]
- fiction [1]
  - martha [1]
  - thirteen [1]
  - yaz [1]
- icons [78]
  - ace [1]
  - adric [1]
  - amy [1]
  - amy+rory+river [1]
  - barbara [1]
  - barbara+ian [1]
  - ben [1]
  - bill+nardole+twelve [1]
  - chang lee [1]
  - clara [1]
  - cybermen [1]
  - dalek [1]
  - dan [1]
  - doctor+master [1]
  - dodo [1]
  - donna [1]
  - eight [1]
  - eleven [2]
  - eleven+river [1]
  - faction paradox [1]
  - fifteen [1]
  - four [1]
  - four+leela [1]
  - four+sarah [1]
  - fugitive doctor [1]
  - grace [1]
  - graham+ryan [1]
  - harry [1]
  - ian [1]
  - ice warriors [1]
  - jamie [1]
  - jamie+victoria [1]
  - jamie+zoe [1]
  - jo [1]
  - katarina [1]
  - leela [1]
  - liz [1]
  - martha [1]
  - mel [1]
  - nardole [1]
  - nine [1]
  - nyssa [1]
  - one [1]
  - osgood [1]
  - peri [1]
  - polly [1]
  - romana [1]
  - romana1 [1]
  - romana2 [1]
  - rory [1]
  - rose [1]
  - ruby [1]
  - sara [1]
  - sarah [1]
  - sarah+three [1]
  - sea devils [1]
  - seven [2]
  - shalka [1]
  - silurians [1]
  - six [1]
  - sontarans [1]
  - steven [1]
  - susan [1]
  - tegan [1]
  - tegan+turlough [1]
  - ten [1]
  - the master [3]
  - the rani [2]
  - thirteen+yaz [1]
  - three [2]
  - turlough [1]
  - two [1]
  - unit [1]
  - vicki [1]
  - victoria [1]
  - yaz [1]
  - zoe [1]
  - zygons [1]
- new series [6]
- nuwho rewatch [72]
- paper dolls [79]
- picture [234]
  - ainley master [2]
  - alien [1]
  - amy [1]
  - amy/rory [1]
  - barbara [1]
  - behind the scenes [16]
  - bill [1]
  - bonnie langford [1]
  - cast [3]
  - christopher eccleston [1]
  - clara [1]
  - convention [1]
  - daphne ashbrook [1]
  - david tennant [1]
  - delgado master [3]
  - donna [2]
  - dvd cover [5]
  - dwm [4]
    - cover [2]
  - eighth doctor [1]
  - eleventh doctor [4]
  - eleventh doctor episo [8]
  - elizabeth sladen [1]
  - exhibition [2]
  - fanart [9]
  - fifth doctor [4]
  - fifth doctor episode [7]
  - fiftheenth doctor epi [1]
  - first doctor [4]
  - first doctor episode [16]
  - fourth doctor [5]
  - fourth doctor episode [11]
  - frazer hines [2]
  - fugitive doctor [1]
  - india fisher [1]
  - jamie [4]
  - jo [3]
  - joanna lumley [1]
  - jodie whittaker [4]
  - k9 [1]
  - leela [2]
  - martha [3]
  - matt smith [1]
  - mickey [1]
  - missy [1]
  - monster [15]
  - new adventures [1]
  - nicholas courtney [2]
  - nicola bryant [1]
  - ninth doctor [1]
  - ninth doctor episode [1]
  - patrick troughton [1]
  - paul mcgann [1]
  - pearl mackie [2]
  - peri [2]
  - peter capaldi [1]
  - production team [1]
  - puzzle [1]
  - river song [1]
  - romana [3]
  - romana 1 [1]
  - romana 2 [2]
  - rose [4]
  - rowan atkinson [1]
  - russell t davies [1]
  - sara [1]
  - sarah [4]
  - second doctor [7]
  - second doctor episode [9]
  - seventh doctor episod [6]
  - shalka doctor [1]
  - sixth doctor [5]
  - sixth doctor episode [4]
  - susan [1]
  - sylvester mccoy [2]
  - tardis [3]
  - tegan [2]
  - tenth doctor [2]
  - tenth doctor episode [12]
  - the brigadier [1]
  - the master [3]
  - theatre [2]
  - third doctor [5]
  - third doctor episode [3]
  - thirteenth doctor [2]
  - thirteenth doctor epi [2]
  - tom baker [2]
  - turlough [1]
  - tv movie [1]
  - twelfth doctor episod [4]
  - unit [1]
  - vicki [1]
  - victoria [3]
  - villain [1]
  - web planet [2]
  - william hartnell [2]
  - yaz [1]
  - zoe [1]
- rec [1]
- review [433]
  - book [34]
    - non-fiction [7]
  - film [1]
  - tv [399]
    - classic [150]
    - new new series [15]
    - new series [233]
- russell davies [3]
- steven moffat [2]
- the randomizer [152]
- verity podcast [1]
- whordle [4]
dolls [78]
- lego [5]
  - nasa [3]
- paper dolls [79]
dreamwidth [3]
edinburgh [8]
- festival [1]
exercise [18]
- running [37]
  - london marathon [19]
facebook [5]
faction paradox [3]
- review [3]
family [12]
- b [23]
  - animals [1]
  - dinosaurs [16]
  - fossils [4]
  - media stardom [19]
- cousins [1]
- days out [1]
- g [4]
  - school [1]
fandom [4]
fandom friday [2]
fandom stocking [1]
fanfiction [4]
feminism [5]
films [8]
follow friday [7]
food [51]
- heston blumenthal [1]
- recipe [40]
fools and heroes [11]
fossil friday [58]
friends [2]
genealogy [16]
granny's diary [5]
grimm [1]
- icons [1]
history [4]
holidays [66]
- cleveland way [5]
- cornwall [3]
- hadrian's wall [23]
- inca trail [9]
- orkney [13]
- ridgeway [3]
- scotland [2]
- snowdonia [5]
- wales [2]
- west highland way [9]
house [17]
i have no tag for this [25]
i saw this last week [112]
icons [47]
- castle [1]
- ladybird books [1]
- pikmin [1]
iris wildthyme [5]
- review [4]
jobs [3]
kin-strife [10]
linkspam [21]
livejournal [14]
lizzie bennet diaries [1]
mathematics [21]
- formal proof [1]
- logic [1]
- non-euclidean [10]
- philosophy [6]
  - proof [2]
- verification [1]
mcu [2]
- icons [1]
  - natasha [1]
media stardom [7]
meme [66]
meta [1]
model checking [4]
- systems
  - java pathfinder [3]
oxford [1]
performing [1]
- music [1]
philosophy [8]
- ai [2]
- ethics [2]
- mathematics [3]
picspam [113]
- castle [32]
- hobbit hole [6]
- house [2]
- inca ruins [2]
- prehistoric monument [100]
- roman remains [14]
- travel [64]
  - holidays [43]
  - work related [22]
pokemon go [2]
- icons [1]
primeval [59]
- fiction [1]
  - becker [1]
  - blade [1]
  - crossover [1]
  - lester [1]
  - ryan [1]
  - ryan/stephen [2]
- icons [4]
  - abby/ryan [1]
  - becker [1]
  - becker/lester [1]
  - becker/matt [1]
  - becker/ryan [1]
  - blade/lester [1]
  - claudia/lester [1]
  - connor [1]
  - connor/lester [1]
  - danny [1]
  - danny/ryan [1]
  - jess/ryan [1]
  - lester [1]
  - lester/ryan [1]
  - nick/stephen [1]
  - ryan [1]
- review [45]
programming [14]
- ail [1]
- languages
  - agentspeak [2]
  - jason [1]
  - java [5]
  - maude [2]
  - prolog [2]
projects
- eass [13]
- mcapl [13]
- platform grant [1]
- rais [2]
- verifiable autonomy [1]
- vps [2]
random doctor who picture [292]
random poetry [1]
rant [6]
reading listening watching [97]
rec [1]
- humour [1]
resolutions [14]
review [591]
- book [136]
  - non-fiction [37]
    - history [25]
      - science [9]
- comic [2]
- film [9]
- tv [409]
  - class [6]
  - internet [1]
  - merlin [2]
  - sarah jane adventures [5]
  - survivors [4]
roleplaying [24]
ros [1]
science [1]
science fiction [2]
science
- astronomy [1]
  - apod [1]
share
- twitter [2]
social networking [3]
- google+ [2]
- tumblr [1]
star wars [2]
- dolls [1]
  - lego [1]
the expanse [2]
- icons [1]
  - crew [1]
the prisoner [1]
- icons [1]
theorem proving [6]
- middle-out reasoning [3]
- proof planning [5]
  - critics [2]
  - rippling [3]
- proof specification lang [2]
- systems
  - isabelle [2]
  - isaplanner [4]
  - maude [1]
  - proof general [3]
- theory slicing [1]
- tptp thf [3]
throwback thursday [53]
- an oxford childhood [12]
- ancestors [3]
- arthurians [6]
- conventions [1]
- dad [3]
- docsoc [1]
- family [1]
- larp [3]
- oules [1]
- politics [1]
- running [1]
- wheatley [3]
tolkienery [7]
- fiction [1]
  - crossover [1]
  - sauron [1]
torchwood [5]
- review [13]
travel [73]
- commuting [2]
- work related [34]
traveller [6]
tv [29]
- blakes seven [1]
- buffy [1]
- firefly [2]
- sapphire and steel [1]
urban dead [5]
web stuff [1]
wierd spam [2]
world war z [1]
- fiction [1]
  - crossover [1]
writing [2]

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