--- title: The sky is blue by day because the air scatters the blue part of sun… — Thinking like an astronomer · tree and pragmatics description: The sky is blue by day because the air scatters the blue part of sunlight all over the sky; on the Moon, with no air, the sky is black even at noon and the stars can be seen beside the Sun. Who acts: sky, air. A sentence of the lesson «Thinking like an astronomer» of the world course of Mova's prima --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/3/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / [Thinking like an astronomer](https://md.mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/) / 3 # Thinking like an astronomer, sentence 3 The sky is blue by day because the air scatters the blue part of sunlight all over the sky; on the Moon, with no air, the sky is black even at noon and the stars can be seen beside the Sun. **Who acts:** sky, air · **What happens:** be, scatter, see · **To what, where:** blue part, sky, Moon, stars, Sun. This is a sentence of the lesson «Thinking like an astronomer» of the world course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (sky, air), what happens, when and where, as Mova's frames read it from the tree. ## The tree {#tree} ```conllu # sent_id = school:world:010-reasoning-about-space.lesson:3 # text = The sky is blue by day because the air scatters the blue part of sunlight all over the sky; on the Moon, with no air, the sky is black even at noon and the stars can be seen beside the Sun. # source = school lesson (ours) # course = world # lesson = 010-reasoning-about-space.lesson # annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1 1 The the DET DT Definite=Def|PronType=Art 2 det _ _ 2 sky sky NOUN NN Number=Sing 4 nsubj _ _ 3 is be AUX VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 4 cop _ _ 4 blue blue ADJ JJ Degree=Pos 0 root _ _ 5 by by ADP IN _ 6 case _ _ 6 day day NOUN NN Number=Sing 4 obl _ _ 7 because because SCONJ IN _ 10 mark _ _ 8 the the DET DT Definite=Def|PronType=Art 9 det _ _ 9 air air NOUN NN Number=Sing 10 nsubj _ _ 10 scatters scatter VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 4 advcl _ _ 11 the the DET DT Definite=Def|PronType=Art 13 det _ _ 12 blue blue ADJ JJ Degree=Pos 13 amod _ _ 13 part part NOUN NN Number=Sing 10 obj _ _ 14 of of ADP IN _ 15 case _ _ 15 sunlight sunlight NOUN NN Number=Sing 13 nmod _ _ 16 all all ADV RB _ 19 advmod _ _ 17 over over ADP IN _ 19 case _ _ 18 the the DET DT Definite=Def|PronType=Art 19 det _ _ 19 sky sky NOUN NN Number=Sing 10 obl _ _ 20 ; ; PUNCT , _ 32 punct _ _ 21 on on ADP IN _ 23 case _ _ 22 the the DET DT Definite=Def|PronType=Art 23 det _ _ 23 Moon Moon PROPN NNP Number=Sing 32 obl _ _ 24 , , PUNCT , _ 27 punct _ _ 25 with with ADP IN _ 27 case _ _ 26 no no DET DT PronType=Neg 27 det _ _ 27 air air NOUN NN Number=Sing 23 nmod _ _ 28 , , PUNCT , _ 23 punct _ _ 29 the the DET DT Definite=Def|PronType=Art 30 det _ _ 30 sky sky NOUN NN Number=Sing 32 nsubj _ _ 31 is be AUX VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 32 cop _ _ 32 black black ADJ JJ Degree=Pos 4 parataxis _ Agree=R7-rel-agree|Haiku=4:conj 33 even even ADV RB _ 35 advmod _ _ 34 at at ADP IN _ 35 case _ _ 35 noon noon NOUN NN Number=Sing 32 obl _ _ 36 and and CCONJ CC _ 41 cc _ _ 37 the the DET DT Definite=Def|PronType=Art 38 det _ _ 38 stars star NOUN NNS Number=Plur 41 nsubj:pass _ _ 39 can can AUX MD VerbForm=Fin 41 aux _ _ 40 be be AUX VB VerbForm=Inf 41 aux:pass _ _ 41 seen see VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 32 conj _ _ 42 beside beside ADP IN _ 44 case _ _ 43 the the DET DT Definite=Def|PronType=Art 44 det _ _ 44 Sun. Sun PROPN NNP Number=Sing 41 obl _ _ ``` ## Pragmatics {#pragmatics} No stored speech act for this sentence. | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **is** | present | the sky | | | | day | blue *property* | tree rules | | 2 | **scatter** | present | the air | the blue part of sunlight | | the sky | | | vn spray-9.7-1 «NP V NP PP.destination»: agent=Agent part=Theme over sky=Destination | | 3 | **is** | present | the sky | | | the Moon with no air | noon | black *property* | tree rules | | 4 | **see** | can · passive | | the stars | | the Sun. | | | vn comprehend-87.2-1-1 «NP V NP»: subject=Stimulus | One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree. **Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:world:010-reasoning-about-space.lesson:3`. **The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence. See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/). - ← previous: [Thinking like an astronomer, 2](https://md.mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/2/) - next →: [Thinking like an astronomer, 4](https://md.mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/4/) - ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/)