diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9434d90..a3b1294 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,8 @@
 
 ### 🚀 New
 
-* [#29](https://vscode.dev/github/sdss/lvmecp/pull/29) Add a new engineering mode that can be used to bypass the heartbeat and to allow the dome to open during daytime.
+* [#29](https://github.com/sdss/lvmecp/pull/29) Add a new engineering mode that can be used to bypass the heartbeat and to allow the dome to open during daytime.
+* [#30](https://github.com/sdss/lvmecp/pull/30) Prevent the dome from opening during daytime. Close if daytime is detected.
 
 ### ✨ Improved
 
@@ -13,7 +14,7 @@
 
 ### 🏷️ Changed
 
-* [#28](https://vscode.dev/github/sdss/lvmecp/pull/28) Removed the automatic setting of the heartbeat variable. Added a `heartbeat` command that will be triggered by a heartbeat middleware.
+* [#28](https://github.com/sdss/lvmecp/pull/28) Removed the automatic setting of the heartbeat variable. Added a `heartbeat` command that will be triggered by a heartbeat middleware.
 
 ### 🔧 Fixed
 
diff --git a/codecov.yml b/codecov.yml
index 3c97002..f415c96 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -8,7 +8,7 @@ coverage:
         target: 85%
         if_not_found: success
         if_ci_failed: error
-        informational: false
+        informational: true
         only_pulls: true
     patch:
       default:
diff --git a/pyproject.toml b/pyproject.toml
index 76f9846..36f887f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "click-default-group>=1.2.2",
     "pyserial-asyncio>=0.6",
     "pymodbus>=3.6.0,<3.7",
-    "lvmopstools>=0.2.0"
+    "lvmopstools[ephemeris]>=0.5.2",
 ]
 
 [project.urls]
diff --git a/python/lvmecp/__main__.py b/python/lvmecp/__main__.py
index ebefee3..77cdcc0 100644
--- a/python/lvmecp/__main__.py
+++ b/python/lvmecp/__main__.py
@@ -75,6 +75,7 @@ async def actor(ctx, with_simulator: bool = False):
         schema_rel = ecp_config["actor"]["schema"]
         ecp_config["actor"]["schema"] = str(pathlib.Path(__file__).parent / schema_rel)
 
+    config.load(ecp_config)  # Update internal configuration
     actor_obj = ECPActor.from_config(ecp_config)
 
     if ctx.obj["verbose"]:
diff --git a/python/lvmecp/actor/actor.py b/python/lvmecp/actor/actor.py
index dfbf355..1f4f93c 100644
--- a/python/lvmecp/actor/actor.py
+++ b/python/lvmecp/actor/actor.py
@@ -64,6 +64,7 @@ def __init__(
         self.semaphore = asyncio.Semaphore(5)
 
         self._emit_status_task: asyncio.Task | None = None
+        self._monitor_dome_task: asyncio.Task | None = None
 
         self._engineering_mode: bool = False
         self._engineering_mode_task: asyncio.Task | None = None
@@ -81,6 +82,7 @@ async def start(self, **kwargs):
         await self.plc.start_modules()
 
         self._emit_status_task = asyncio.create_task(self.emit_status())
+        self._monitor_dome_task = asyncio.create_task(self.monitor_dome())
 
         return self
 
@@ -88,6 +90,8 @@ async def stop(self, **kwargs):
         """Stops the actor."""
 
         self._emit_status_task = await cancel_task(self._emit_status_task)
+        self._monitor_dome_task = await cancel_task(self._monitor_dome_task)
+
         self._engineering_mode_task = await cancel_task(self._engineering_mode_task)
 
         await super().stop(**kwargs)
@@ -102,6 +106,18 @@ async def emit_status(self, delay: float = 30.0):
             await self.send_command(self.name, "status", internal=True)
             await asyncio.sleep(delay)
 
+    async def monitor_dome(self, delay: float = 30.0):
+        """Monitors the dome and closes during daytime."""
+
+        while True:
+            await asyncio.sleep(delay)
+
+            if self._engineering_mode:
+                pass
+            elif self.plc.dome.is_daytime():
+                self.write("w", text="Dome found open during daytime. Closing.")
+                await self.plc.dome.close()
+
     async def engineering_mode(
         self,
         enable: bool,
diff --git a/python/lvmecp/dome.py b/python/lvmecp/dome.py
index 6b6133a..2b80175 100644
--- a/python/lvmecp/dome.py
+++ b/python/lvmecp/dome.py
@@ -13,7 +13,10 @@
 from time import time
 from types import SimpleNamespace
 
-from lvmecp import log
+from astropy.time import Time
+from lvmopstools.ephemeris import get_ephemeris_summary
+
+from lvmecp import config, log
 from lvmecp.exceptions import DomeError, ECPWarning
 from lvmecp.maskbits import DomeStatus
 from lvmecp.module import PLCModule
@@ -145,6 +148,9 @@ async def _move(self, open: bool, force: bool = False):
     async def open(self, force: bool = False):
         """Open the dome."""
 
+        if not self.is_allowed():
+            raise DomeError("Dome cannot be opened during daytime.")
+
         await self._move(True, force=force)
 
     async def close(self, force: bool = False):
@@ -172,3 +178,47 @@ async def reset(self):
 
         await self.modbus["rolloff_error_reset"].set(1)
         await asyncio.sleep(1)
+
+    def is_allowed(self):
+        """Returns whether the dome is allowed to move.
+
+        Currently the only check performed is to confirm that it is not daytime,
+        but this method could be expanded in the future.
+
+        """
+
+        is_daytime: bool | None
+        if not config["dome.daytime_allowed"]:
+            is_daytime = self.is_daytime()
+        else:
+            is_daytime = None
+
+        if not is_daytime:
+            return True
+
+        if self.plc._actor and self.plc._actor._engineering_mode:
+            self.plc._actor.write(
+                "w",
+                text="Daytime detected but engineering mode is active. "
+                "Allowing to open the dome.",
+            )
+            return True
+
+        return False
+
+    def is_daytime(self):  # pragma: no cover
+        """Returns whether it is daytime."""
+
+        daytime_tolerance = config["dome.daytime_tolerance"] or 0.0
+
+        ephemeris = get_ephemeris_summary()
+        sunset = ephemeris["sunset"] - daytime_tolerance / 86400
+        sunrise = ephemeris["sunrise"] + daytime_tolerance / 86400
+
+        now = Time.now().jd
+        assert isinstance(now, float)
+
+        if now < sunset or now > sunrise:
+            return True
+
+        return False
diff --git a/python/lvmecp/etc/lvmecp.yml b/python/lvmecp/etc/lvmecp.yml
index 6281bfb..a51f596 100644
--- a/python/lvmecp/etc/lvmecp.yml
+++ b/python/lvmecp/etc/lvmecp.yml
@@ -172,6 +172,10 @@ safety:
   override_local_mode: False
   o2_threshold: 19.5
 
+dome:
+  daytime_allowed: false
+  daytime_tolerance: 600
+
 hvac:
   host: 10.8.38.49
   port: 502
diff --git a/python/lvmecp/plc.py b/python/lvmecp/plc.py
index 333643e..36e4ad1 100644
--- a/python/lvmecp/plc.py
+++ b/python/lvmecp/plc.py
@@ -69,6 +69,8 @@ def __init__(
         self.config = config
         self.modbus = Modbus(config=config["modbus"])
 
+        self._actor = actor
+
         self.dome = DomeController(
             "dome",
             self,
diff --git a/tests/test_command_dome.py b/tests/test_command_dome.py
new file mode 100644
index 0000000..bccc791
--- /dev/null
+++ b/tests/test_command_dome.py
@@ -0,0 +1,111 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# @Author: José Sánchez-Gallego (gallegoj@uw.edu)
+# @Date: 2024-12-24
+# @Filename: test_command_dome.py
+# @License: BSD 3-clause (http://www.opensource.org/licenses/BSD-3-Clause)
+
+from __future__ import annotations
+
+import asyncio
+
+from typing import TYPE_CHECKING
+
+import lvmecp.dome
+from lvmecp.maskbits import DomeStatus
+
+
+if TYPE_CHECKING:
+    from pytest_mock import MockerFixture
+
+    from lvmecp.actor import ECPActor
+
+
+async def test_command_dome_open(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(actor.plc.dome, "is_daytime", return_value=False)
+    mocker.patch.object(actor.plc.dome, "_move", return_value=True)
+
+    mocker.patch.object(actor.plc.dome, "status", return_value=DomeStatus.OPEN)
+
+    cmd = await actor.invoke_mock_command("dome open")
+    await cmd
+
+    assert cmd.status.did_succeed
+
+
+async def test_command_dome_close(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(actor.plc.dome, "_move", return_value=True)
+
+    mocker.patch.object(actor.plc.dome, "status", return_value=DomeStatus.CLOSED)
+
+    cmd = await actor.invoke_mock_command("dome close")
+    await cmd
+
+    assert cmd.status.did_succeed
+
+
+async def test_command_dome_daytime(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(actor.plc.dome, "is_daytime", return_value=True)
+    mocker.patch.object(actor.plc.dome, "_move", return_value=True)
+
+    cmd = await actor.invoke_mock_command("dome open")
+    await cmd
+
+    assert cmd.status.did_fail
+
+
+async def test_command_dome_daytime_allowed(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(
+        lvmecp.dome,
+        "config",
+        return_value={"dome": {"daytime_allowed": True}},
+    )
+    mocker.patch.object(actor.plc.dome, "is_daytime", return_value=True)
+    mocker.patch.object(actor.plc.dome, "_move", return_value=True)
+
+    mocker.patch.object(actor.plc.dome, "status", return_value=DomeStatus.OPEN)
+
+    cmd = await actor.invoke_mock_command("dome open")
+    await cmd
+
+    assert cmd.status.did_succeed
+
+
+async def test_command_dome_daytime_eng_mode(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(actor.plc.dome, "is_daytime", return_value=True)
+    mocker.patch.object(actor.plc.dome, "_move", return_value=True)
+    mocker.patch.object(actor, "_engineering_mode", return_value=True)
+
+    mocker.patch.object(actor.plc.dome, "status", return_value=DomeStatus.OPEN)
+
+    cmd = await actor.invoke_mock_command("dome open")
+    await cmd
+
+    assert cmd.status.did_succeed
+
+
+async def test_actor_daytime_task(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(actor.plc.dome, "is_daytime", return_value=True)
+    dome_close_mock = mocker.patch.object(actor.plc.dome, "close")
+
+    task = asyncio.create_task(actor.monitor_dome(delay=0.1))
+    await asyncio.sleep(0.2)
+
+    dome_close_mock.assert_called_once()
+
+    task.cancel()
+
+
+async def test_actor_daytime_task_eng_mode(actor: ECPActor, mocker: MockerFixture):
+    mocker.patch.object(actor.plc.dome, "is_daytime", return_value=True)
+    mocker.patch.object(actor, "_engineering_mode", return_value=True)
+
+    dome_close_mock = mocker.patch.object(actor.plc.dome, "close")
+
+    task = asyncio.create_task(actor.monitor_dome(delay=0.1))
+    await asyncio.sleep(0.2)
+
+    dome_close_mock.assert_not_called()
+
+    task.cancel()
diff --git a/tests/test_command_engineering_mode.py b/tests/test_command_engineering_mode.py
index 6705ee0..95af87f 100644
--- a/tests/test_command_engineering_mode.py
+++ b/tests/test_command_engineering_mode.py
@@ -3,7 +3,7 @@
 #
 # @Author: José Sánchez-Gallego (gallegoj@uw.edu)
 # @Date: 2024-12-24
-# @Filename: test_command_heartbeat.py
+# @Filename: test_command_engineering_mode.py
 # @License: BSD 3-clause (http://www.opensource.org/licenses/BSD-3-Clause)
 
 from __future__ import annotations
diff --git a/uv.lock b/uv.lock
index ed9e908..6369aae 100644
--- a/uv.lock
+++ b/uv.lock
@@ -161,6 +161,63 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/a9/37/3fa718aaadd36e073891138dc3ebd919a71bafd4881c97d8a133265af191/argcomplete-3.5.2-py3-none-any.whl", hash = "sha256:036d020d79048a5d525bc63880d7a4b8d1668566b8a76daf1144c0bbe0f63472", size = 43506 },
 ]
 
+[[package]]
+name = "astroplan"
+version = "0.10.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "astropy" },
+    { name = "numpy" },
+    { name = "pytz" },
+    { name = "six" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/48/80/1be3af06717245a51adaf6994b682b3ee25ace9bfe5d443d440209d627df/astroplan-0.10.1.tar.gz", hash = "sha256:39d97c3377e1630abff3a94d8c956980f77a3e809e27a0376dd7d30abe3b6959", size = 140603 }
+
+[[package]]
+name = "astropy"
+version = "7.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "astropy-iers-data" },
+    { name = "numpy" },
+    { name = "packaging" },
+    { name = "pyerfa" },
+    { name = "pyyaml" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/6a/12/d6ad68d5acd751e3827d54a64333e0dd789bcc747fe9528f5758b35421f8/astropy-7.0.0.tar.gz", hash = "sha256:e92d7c9fee86eb3df8714e5dd41bbf9f163d343e1a183d95bf6bd09e4313c940", size = 7130087 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d6/54/de05566563bb3327d7878cec81507ad5677801f5739eb7623dffef6f6a39/astropy-7.0.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:0ada206f13b1e9c9c07ae0fce55e3090d694c555107c23c30b271a58fea1732b", size = 6664940 },
+    { url = "https://files.pythonhosted.org/packages/e3/b4/308bcffcde4c971245f75a8805a6b7606d150090ff9e94317b818808e0ca/astropy-7.0.0-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:d5f5657a1443421b0ab8ae6afa85fc7934f5e384648b7acef21aca5918acfca8", size = 6540264 },
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+
+[[package]]
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