## sql – Implementation of a Sunrise/Sunset algorithm from wikipedia

I’m trying to implement a sunset/sunrise algorithm found on this Wikipedia page: https://en.wikipedia.org/wiki/Sunrise_equation#Complete_calculation_on_Earth

The function accepts the longitude, latitude and date for which the calculation must be done. It will be used in a PostgreSQL database – plpgsql was a language of choice as the standard library offers everything we need.

This is what I came up with. It is a litteral transcript of every step. Since it is said that all constants are expressed in degrees, I assumed that every trigonometry function must be called with degrees arguments.

``````create or replace function sun(lng decimal, lat decimal, date date)
returns time()
language plpgsql
as \$\$
declare
j   decimal := extract(julian from date);
n   decimal := ceil(j - 2451545 + 0.0008);
j_  decimal := n - (lng / 360);
m   decimal := (357.5291 + 0.98560028 * j_) % 360;
c   decimal := 1.9148 * sind(m) + 0.02 * sind(2 * m) + 0.0003 * sind(3 * m);
λ   decimal := (m + c + 180 + 102.8372) % 360;
jt  decimal := 2451545 + j_ + 0.0053 * sind(m) - 0.0069 * sind(2 * λ);
δ   decimal := asind(sind(λ) * sind(23.44));
ω   decimal := acosd((sind(0.83) - sind(lat) * sind(δ))/(cosd(lat) * cosd(δ)));
sunrise time := to_timestamp((jt - ω / 360) % 1 * 24 * 3600)::time;
sunset  time := to_timestamp((jt + ω / 360) % 1 * 24 * 3600)::time;
begin
return array(sunrise, sunset);
end;
\$\$;
``````

The problem is that the returned values are nowhere near close the expected result.
For exemple, if I want today’s values for Paris:

``````select sun(2.35, 48.88, '2021-06-16'::date);
-- results:
--   sunrise: 15:59 (expected 05:46 )
--   sunset : 07:43 (expected 21:56 )
``````

I’m not quite sure what I’m doing wrong here.
I found another algorithm which I successfully translated into plpgsql, but is longer and requires two different path for sunset and sunrise calculation, so I’d prefer to get the other one right.

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## Find how many words are in the Wikipedia article for “computer”?

I am getting the answer "8879" but, the article is updated and hence answer doesn’t matches the expected output "7742", what should I do.

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## Barra de busqueda en Django no redirecciona (en una web estilo wikipedia)

estoy programando una web que funcione de forma similar a la wikipedia usando Django. Ya he logrado que añadiendo a la url el nombre de una entrada(por ejemplo, “Django”), tal que así: http://127.0.0.1:8000/wiki/Django, el contenido de esta entrada se muestre, pero cuando introduzco en la barra de busqueda la palabra “Django”, la url resultante es: http://127.0.0.1:8000/wiki/?q=Django, y no se produce ningún cambio en la web.

Este es el form que utilizo en la barra de búsqueda(en el archivo layout.html):

``````<div class="row">
<div class="sidebar col-lg-2 col-md-3">
<h2>Wiki</h2>
<form>
<input class="search" type="search" name="q" placeholder="Search Encyclopedia">
</form>
<div>
<a href="{% url 'index' %}">Home</a>
</div>
<div>
<a href="{% url 'create' %}">Create Page</a>
</div>

``````

Este es el path que utilizo en urls.py:

``````    urlpatterns = (
path("", views.index, name="index"),
path("<str:title>", views.entry, name="entry"),
path("q", views.search, name="search")
``````

)

Y este, el archivo views.py:

``````from django.http import HttpResponseRedirect

from . import util

def index(request):
return render(request, "encyclopedia/index.html", {
"entries": util.list_entries()
})

def entry (request, title):
return render(request, "encyclopedia/entry.html", {
"info": util.get_entry(title),
"title": title
})

def create (request):
return render(request, "encyclopedia/create.html")

def search (request, q):
q = request.GET.get('q','')
return render ("encyclopedia/entry.html", {
"info": util.get_entry(q),
"title": q
})
``````

Tambien tengo el archivo util.py con ciertas funciones:

``````import re

from django.core.files.base import ContentFile
from django.core.files.storage import default_storage

def list_entries():
"""
Returns a list of all names of encyclopedia entries.
"""
_, filenames = default_storage.listdir("entries")
return list(sorted(re.sub(r".md\$", "", filename)
for filename in filenames if filename.endswith(".md")))

def save_entry(title, content):
"""
Saves an encyclopedia entry, given its title and Markdown
content. If an existing entry with the same title already exists,
it is replaced.
"""
filename = f"entries/{title}.md"
if default_storage.exists(filename):
default_storage.delete(filename)
default_storage.save(filename, ContentFile(content))

def get_entry(title):
"""
Retrieves an encyclopedia entry by its title. If no such
entry exists, the function returns None.
"""
try:
f = default_storage.open(f"entries/{title}.md")
except FileNotFoundError:
return None
``````

¡Muchas gracias por su atención!

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I am looking for a how to do context search on wikipedia articles – preferrably via api so I don’t have to download and process terabytes of wikipedia articles – using a/the mentioned set of keywords.

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